Current weather · Sep 26, 12:30 PM CDT

25.9100, -97.5310

92°

Chance of light rain showersFeels like 102° · Humidity 56%NWS forecast for this hour; no recent station reportForecast by NWS Brownsville/Rio Grande Valley, TX · grid 76,6
High
96°
Low
80°
Rain today
34%
Sunrise
7:20 AM
Sunset
7:22 PM

Hour by hour

NWS forecast grid

Scroll sideways for more hours. Pick an hour for every number.

Every hour as a table48 hours
TimeWeatherTemperatureFeels likeDew pointHumidityChanceAmountSnowDirWindGustSky coverThunderPressureVisibilityCeiling
Sat 12 PMChance of light rain showers92°102°74°56%25%ESE8 mph14 mph36%9%——
Sat 1 PMChance of light rain showers and slight chance of thunderstorms94°104°74°52%34%0.00 inE9 mph15 mph45%21%——
Sat 2 PMChance of light rain showers and slight chance of thunderstorms94°104°73°51%25%0.00 inE9 mph16 mph55%21%——
Sat 3 PMSlight chance of thunderstorms and slight chance of light rain showers94°105°74°52%19%0.00 inE10 mph18 mph61%19%——
Sat 4 PM95°106°74°51%13%0.00 inE12 mph20 mph57%13%——
Sat 5 PM93°102°74°54%13%0.00 inE12 mph20 mph40%13%——
Sat 6 PM91°101°74°57%9%0.00 inE10 mph18 mph30%9%——
Sat 7 PM89°99°74°61%0%ESE9 mph16 mph40%——
Sat 8 PM85°94°75°71%0%ESE7 mph13 mph30%——
Sat 9 PM84°93°75°73%0%ESE6 mph12 mph27%——
Sat 10 PM84°92°75°74%0%ESE5 mph9 mph21%——
Sat 11 PM83°91°75°77%0%ESE3 mph7 mph11%——
Sun 12 AM83°90°75°78%0%SE2 mph6 mph6%——
Sun 1 AM82°88°75°80%1%SE1 mph5 mph4%1%——
Sun 2 AM82°88°75°80%0%ESE1 mph5 mph13%——
Sun 3 AM80°86°75°84%0%ESE1 mph5 mph30%——
Sun 4 AM80°85°75°86%1%ESE2 mph5 mph34%1%——
Sun 5 AM80°84°75°86%2%E2 mph5 mph28%2%——
Sun 6 AM79°83°75°87%2%ESE2 mph5 mph33%2%——
Sun 7 AM79°83°75°87%2%E2 mph5 mph19%2%——
Sun 8 AM79°84°76°89%2%E2 mph5 mph35%2%——
Sun 9 AM83°91°77°84%1%E1 mph5 mph21%1%——
Sun 10 AM87°98°76°68%1%SE2 mph5 mph41%1%——
Sun 11 AM90°99°74°61%2%SE3 mph6 mph28%2%——
Sun 12 PM93°102°73°52%3%ESE3 mph6 mph24%3%——
Sun 1 PM95°104°72°47%8%ESE3 mph7 mph39%8%——
Sun 2 PM95°103°71°46%8%E6 mph10 mph52%8%——
Sun 3 PM96°105°72°46%9%E7 mph13 mph49%9%——
Sun 4 PM95°105°73°49%9%ESE10 mph16 mph53%9%——
Sun 5 PM93°102°73°52%4%E12 mph18 mph55%4%——
Sun 6 PM91°100°73°56%4%E12 mph18 mph45%4%——
Sun 7 PM88°95°73°63%1%ESE10 mph17 mph21%1%——
Sun 8 PM85°93°74°69%1%ESE8 mph15 mph42%1%——
Sun 9 PM84°92°74°72%0%ESE6 mph13 mph40%——
Sun 10 PM84°91°74°73%0%ESE5 mph10 mph33%——
Sun 11 PM83°90°75°75%0%SE3 mph8 mph32%——
Mon 12 AM82°89°75°77%0%SE3 mph7 mph31%——
Mon 1 AM82°88°74°79%0%SE3 mph7 mph25%——
Mon 2 AM82°88°74°79%2%SE2 mph6 mph28%2%——
Mon 3 AM80°85°75°83%4%SE2 mph5 mph27%4%——
Mon 4 AM80°84°75°85%3%SE2 mph5 mph28%3%——
Mon 5 AM79°83°75°86%2%SE1 mph5 mph24%2%——
Mon 6 AM79°79°75°87%4%ESE1 mph3 mph25%4%——
Mon 7 AM79°79°74°87%6%E2 mph5 mph36%6%——
Mon 8 AM81°88°75°82%6%SE2 mph5 mph21%6%——
Mon 9 AM84°93°76°75%6%SE3 mph5 mph20%6%——
Mon 10 AM87°98°76°68%6%SE3 mph6 mph20%9%——
Mon 11 AM90°100°75°61%6%SE3 mph7 mph23%9%——

The next 16 days

NWS grid published Sep 26, 12:27 PM CDT to day 8, the National Blend of Models to day 11, the mean of GFS, ECMWF, ECMWF AI to day 16
  1. TodaySep 2696°80°Chance Showers And Thunderstorms34%0.02 inwind 12 mph · gusts 20 mph
  2. SunSep 2797°78°Mostly Sunny9%wind 12 mph · gusts 18 mph
  3. MonSep 2896°80°Mostly Sunny then Chance Showers And Thunderstorms33%wind 13 mph · gusts 21 mph
  4. TueSep 2996°82°Mostly Sunny then Chance Showers And Thunderstorms25%wind 17 mph · gusts 30 mph
  5. WedSep 3097°81°Mostly Sunny then Slight Chance Showers And Thunderstorms16%0.01 inwind 20 mph · gusts 37 mph
  6. ThuOct 195°79°Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms51%0.38 inwind 17 mph · gusts 31 mph
  7. FriOct 294°78°Chance Showers And Thunderstorms45%0.76 inwind 10 mph · gusts 20 mph
  8. SatOct 392°78°44%0.20 inwind 10 mph · gusts 18 mph
  9. SunOct 491°76°National Blend49%0.21 inwind 10 mph · gusts 18 mph
  10. MonOct 589°74°National Blend50%0.35 inwind 13 mph · gusts 23 mph
  11. TueOct 687°73°National Blend36%0.37 inwind 14 mph · gusts 25 mph
  12. WedOct 7~84°70°Model mean
  13. ThuOct 8~82°72°Model mean0.06 in
  14. FriOct 9~83°70°Model mean
  15. SatOct 10~81°69°Model mean
  16. SunOct 11~85°70°Model mean

Right now

NWS grid for this hour · UV from the EPA · air quality from AirNow
  • Feels like102°
  • WindESE 8 mphgusts 14 mph
  • Radar over this pointno reading
  • Humidity56%
  • Dew point74°
  • Pressure—
  • UV index—
  • Air quality—
  • Visibility—
  • Sunrise and sunsetSunrise · Sunset
  • Moonrise7:19 PMMoonset 7:13 AM
  • Moon phaseFull moon100% lit

The National Blend of Models

NOAA NBM v5.0 · run of Sep 26, 7:00 AM CDT

NOAA’s weighted blend of every model it runs, to eleven days, with the chances the grid above does not carry. Where the local office’s grid reaches, its figure sits beneath the blend’s; where it does not, the blend stands alone.

  1. TodaySep 2696°79°NWS grid 96° / 80°rain 42%thunder 21%wind 12 mph · gusts 20 mph
  2. SunSep 2797°79°NWS grid 97° / 78°rain 22%thunder 20%wind 12 mph · gusts 18 mph
  3. MonSep 2897°80°NWS grid 96° / 80°rain 38%thunder 25%wind 12 mph · gusts 20 mph
  4. TueSep 2997°83°NWS grid 96° / 82°rain 27%thunder 21%wind 16 mph · gusts 29 mph
  5. WedSep 3097°82°NWS grid 97° / 81°rain 19%thunder 25%wind 21 mph · gusts 37 mph
  6. ThuOct 196°79°NWS grid 95° / 79°rain 47%thunder 31%0.60 inwind 17 mph · gusts 31 mph
  7. FriOct 293°77°NWS grid 94° / 78°rain 52%thunder 32%0.66 inwind 12 mph · gusts 21 mph
  8. SatOct 392°77°NWS grid 92° / 78°rain 50%thunder 28%0.46 inwind 10 mph · gusts 18 mph
  9. SunOct 491°76°Beyond the NWS gridrain 49%0.21 inwind 10 mph · gusts 18 mph
  10. MonOct 589°74°Beyond the NWS gridrain 50%0.35 inwind 13 mph · gusts 23 mph
  11. TueOct 687°73°Beyond the NWS gridrain 36%0.37 inwind 14 mph · gusts 25 mph
77°91°104°SunMonTueWedThuFriSat

BlendNWS gridChance of rain, hourly

The models, side by side

HRRR Sep 26, 7:00 AM CDT · GFS Sep 26, 1:00 AM CDT · GEFS Sep 26, 1:00 AM CDT · ECMWF Sep 25, 7:00 PM CDT · ECMWF AI Sep 25, 7:00 PM CDT

Each line is one model’s own forecast at its own grid cell: three kilometers for HRRR, a quarter of a degree for the global models, which can sit a few hundred meters above or below the town. Where they agree the forecast is settled; where they part is where it is not.

68°86°104°SunMonTueWedThuFriSat

DayNWS gridHRRRGFSGEFSECMWFECMWF AI
Today Sep 2696° 80°0.02 in96° 81°93° 81°91° 82°0.02 in92° 81°0.06 in~93° 80°0.02 in
Sun Sep 2797° 78°96° 79°0.56 in93° 80°92° 81°95° 78°~94° 80°0.02 in
Mon Sep 2896° 80°80° 78°92° 80°0.02 in91° 81°0.03 in87° 77°~94° 79°
Tue Sep 2996° 82°—93° 81°92° 82°0.02 in96° 79°0.01 in~94° 80°0.03 in
Wed Sep 3097° 81°0.01 in—93° 83°0.02 in92° 84°0.10 in96° 82°0.03 in~95° 83°0.07 in
Thu Oct 195° 79°0.38 in—93° 82°0.07 in90° 83°0.61 in96° 82°0.11 in~94° 84°0.58 in
Fri Oct 294° 78°0.76 in—91° 82°0.33 in88° 81°0.53 in~94° 81°0.04 in~84° 76°0.71 in
Sat Oct 392° 78°0.20 in—92° 80°0.02 in90° 80°0.17 in~91° 78°0.39 in~85° 77°0.57 in
Sun Oct 4——96° 79°89° 80°0.14 in~81° 74°1.13 in~89° 77°0.12 in
Mon Oct 5——82° 71°0.18 in86° 80°0.31 in~77° 74°0.93 in~89° 78°
Tue Oct 6——~84° 66°~80° 80°~82° 71°0.17 in~85° 74°
Wed Oct 7——~86° 72°—~83° 69°~84° 70°
Thu Oct 8——~81° 77°0.01 in—~80° 73°0.17 in~86° 66°
Fri Oct 9——~82° 75°—~81° 71°~87° 65°
Sat Oct 10——~76° 72°—~81° 68°~87° 67°
Sun Oct 11——~85° 70°———

A ~ marks a high or low read from six-hourly steps, which miss the true extreme by a degree or two.

ECMWF ensemble meteogram

ECMWF ensemble meteogram for this place: box plots of cloud cover, precipitation, wind speed and temperature from the 51 ensemble members for ten days.
Rendered by ECMWF from its 51-member ensemble, in metric units: each box spans the middle half of the members, the whiskers the rest, the line the control run. A forecast, not an observation. © ECMWF, CC BY 4.0.

The next 90 days

NOAA GHCN normals and records at Brownsville International (BRO) · Climate Prediction Center outlooks

No forecast has skill day by day past about two weeks, and this page does not print one. Where the models stop, the calendar takes over: the 1991 to 2020 normal for each date, the record high and low ever set on it, and where the Climate Prediction Center leans warm, cool, wet or dry over the coming weeks, the month and the season. A site that shows a high for a date three months out is showing you this normal with a wobble.

The forecast reaches Sun Oct 11, from the NWS grid, then the National Blend, then the mean of the global models. Beyond it the lines are the calendar.

20°40°60°80°100°TodayOct 1Nov 1Dec 1

Forecast high and lowNormal high and lowRecord high and low

Week ofNormalWarmest on recordColdest on recordTemperature leanPrecipitation lean
Sep 2688° / 70°100° (2005)51° (1909)no outlookno outlook
Oct 388° / 70°99° (1900)44° (2000)no outlookno outlook
Oct 1088° / 70°96° (2019)44° (2000)no outlookno outlook
Oct 1786° / 67°97° (2012)40° (1989)no outlookno outlook
Oct 2482° / 63°98° (2025)39° (1993)no outlookno outlook
Oct 3181° / 61°98° (1906)35° (1993)no outlookno outlook
Nov 781° / 62°95° (1989)36° (1907)no outlookno outlook
Nov 1479° / 58°92° (2024)28° (1901)no outlookno outlook
Nov 2177° / 56°93° (1988)35° (1932)no outlookno outlook
Nov 2876° / 56°92° (1949)27° (1911)no outlookno outlook
Dec 574° / 55°94° (1977)20° (1901)no outlookno outlook
Dec 1274° / 54°90° (2019)20° (1901)no outlookno outlook
Dec 1974° / 54°91° (2015)15° (1901)no outlookno outlook

Health and activities

Rules of thumb over the next 24 hours of forecast, the warnings in force, the station’s report, air quality and pollen

None of these is a measurement. Each is a rating of the forecast ahead, and of what is happening at the point right now, against what the activity or the ailment is known to mind, and each names the figure that decided it. An ailment or a pest is rated as a risk, low to extreme; an activity, a chore or a journey as a condition, poor to ideal.

Each rating says which span it is for: the rest of today’s daylight, tonight, or the next 24 hours.

Health

  • Arthritisnext 24 hLowsteady conditions
  • Sinus pressurenext 24 hLowsteady conditions
  • Common coldtodayLowmild
  • FlutodayLowmild
  • Migrainenext 24 hModerateheat
  • Asthmanext 24 hLowclean air
  • Heat stresstodayExtremeheat
  • SunburntodayLowweak sun
  • Frostbitenext 24 hLowmild
  • SleepingtonightPoorwarm night

Outdoors

  • RunningtodayFairhot
  • HikingtodayGoodhot
  • BikingtodayGoodhot
  • GolftodayGoodchance of rain
  • FishingtodayIdealfine conditions
  • Boating and paddlingtodayVery goodwind
  • Beach and pooltodayVery goodchance of rain
  • CampingtonightVery goodfine conditions
  • StargazingtonightGoodbright moon

Travel

  • Air travelnext 24 hIdealclear skies
  • Drivingnext 24 hIdealclear roads

Home and garden

  • Lawn mowingtodayGoodchance of rain
  • GardeningtodayGoodchance of rain
  • Outdoor entertainingtodayGoodhot
  • Drying laundry outsidetodayGoodchance of rain
  • Painting and outdoor projectstodayGoodchance of rain
  • FrosttonightLowmild

Pests

  • MosquitoestodayHighwarm
  • TickstodayModeratewarm
  • Indoor pestsnext 24 hLowmild
  • Outdoor peststodayHighwarm

Stargazing

Worked out from the NWS hourly forecast and the sun and moon

Tonight has no dark, clear hour without a bright moon in this forecast. Rated fair.

Night ofRatingDarkClear hoursClear and moonlessMoon litTransparency (est.)DewStrongest wind
SaturdayFair8:38 PM to 6:04 AM4 of 9None100%Fair6 mph
SundayPoor8:37 PM to 6:05 AM0 of 9None98%6 mph
MondayPoor8:36 PM to 6:05 AM0 of 9None93%10 mph
TuesdayPoor8:35 PM to 6:06 AM0 of 9None87%17 mph
WednesdayPoor8:34 PM to 6:06 AM0 of 9None79%20 mph
ThursdayPoor8:33 PM to 6:07 AM0 of 9None70%10 mph
FridayPoor8:32 PM to 6:07 AM0 of 9None60%7 mph

Dark is the sun 18 degrees below the horizon; where it never gets that low, 12 degrees, marked nautical. Clear is sky cover of 20% or less. A bright moon is one above the horizon with a quarter or more of its disc lit. Transparency in the table is estimated from surface humidity (70% and 85% mark fair and poor) and visibility, since the forecast carries no haze or high cloud moisture. Seeing and transparency by hour, where shown, are Environment and Climate Change Canada’s astronomy forecast (regional model; seeing from cloud, wind shear, turbulence near the ground and the surface temperature trend; transparency from the moisture through the whole air column), under the Open Government Licence - Canada. Dew is the air within 2 °C of its dew point. Excellent is four or more clear moonless hours with good transparency; good is three; fair is one, or two clear hours.

Golden hour and blue hour

Computed from the sun and moon positions
DayBlue hour, morningGolden hour, morningGolden hour, eveningBlue hour, evening
Sat6:57 AM to 7:06 AM7:06 AM to 7:51 AM6:52 PM to 7:36 PM7:36 PM to 7:45 PM
Sun6:58 AM to 7:07 AM7:07 AM to 7:51 AM6:50 PM to 7:35 PM7:35 PM to 7:44 PM
Mon6:58 AM to 7:07 AM7:07 AM to 7:52 AM6:49 PM to 7:34 PM7:34 PM to 7:43 PM
Tue6:59 AM to 7:08 AM7:08 AM to 7:52 AM6:48 PM to 7:33 PM7:33 PM to 7:42 PM
Wed6:59 AM to 7:08 AM7:08 AM to 7:53 AM6:47 PM to 7:32 PM7:32 PM to 7:41 PM
Thu7:00 AM to 7:08 AM7:08 AM to 7:53 AM6:46 PM to 7:31 PM7:31 PM to 7:40 PM
Fri7:00 AM to 7:09 AM7:09 AM to 7:53 AM6:45 PM to 7:30 PM7:30 PM to 7:38 PM
NESWSRSSMRMS
  • SR Sunrise 7:20 AM, 91° E
  • SS Sunset 7:22 PM, 269° W
  • MR Moonrise 7:19 PM, 83° E
  • MS Moonset 7:13 AM, 273° W
  • Full moon, 100% lit

Golden hour is the sun between 6 degrees above the horizon and 4 degrees below it; blue hour is the sun between 4 and 6 degrees below. These are the definitions timeanddate.com and PhotoPills use. Directions are degrees clockwise from true north, where the sun’s upper edge and the moon’s center cross a flat horizon; hills and buildings change both. None means the sun does not reach that height on the day; all day means it stays inside the band.

Drone flying

NWS hourly forecast, SWPC Kp, FAA TFRs and 14 CFR Part 107

This hour: good to fly. Next good stretch: Sun 8 AM to 4 PM, 8 hours.

Today: civil twilight for Part 107 6:50 AM to sunrise 7:20 AM, and sunset 7:22 PM to 7:52 PM. Anti-collision lighting is required in those minutes and at night.

Sat12 PM6 PM
Sun12 AM6 AM12 PM6 PM
Mon12 AM6 AM12 PM6 PM

Good Caution No-fly

HourVerdictWind (mph)400 ft est. (mph)Gust (mph)RainVisibilityCloud allowsTempKpWhy
Sat 12 PMGood8101525%92°nothing against it
Sat 1 PMNo-fly9111734%94°thunderstorms possible, chance of rain
Sat 2 PMNo-fly9121925%94°thunderstorms possible, gusts near or over your limit
Sat 3 PMCaution10132119%94°gusts near or over your limit, thunderstorms possible
Sat 4 PMNo-fly12172513%95°gusts near or over your limit, thunderstorms possible
Sat 5 PMNo-fly12172513%93°gusts near or over your limit, thunderstorms possible
Sat 6 PMCaution1013219%91°gusts near or over your limit
Sat 7 PMNo-fly922290%89°gusts near or over your limit, wind at 400 ft near or over your limit, night: lighting and night training required (107.29)
Sat 8 PMCaution717220%85°gusts near or over your limit, night: lighting and night training required (107.29)
Sat 9 PMNo-fly623290%84°gusts near or over your limit, wind at 400 ft near or over your limit, night: lighting and night training required (107.29)
Sat 10 PMCaution518230%84°wind at 400 ft near or over your limit, gusts near or over your limit, night: lighting and night training required (107.29)
Sat 11 PMCaution314170%83°night: lighting and night training required (107.29)
Sun 12 AMCaution29130%83°night: lighting and night training required (107.29)
Sun 1 AMCaution1581%82°night: lighting and night training required (107.29)
Sun 2 AMCaution1580%82°night: lighting and night training required (107.29)
Sun 3 AMCaution1580%80°night: lighting and night training required (107.29)
Sun 4 AMCaution29111%80°night: lighting and night training required (107.29)
Sun 5 AMCaution29112%80°night: lighting and night training required (107.29)
Sun 6 AMCaution29112%79°night: lighting and night training required (107.29)
Sun 7 AMCaution2352%79°civil twilight: lighting required (107.29)
Sun 8 AMGood2352%79°nothing against it
Sun 9 AMGood1151%83°nothing against it
Sun 10 AMGood2351%87°nothing against it
Sun 11 AMGood3462%90°nothing against it

Flight restrictions nearby

Reading the FAA’s temporary flight restrictions.

Flight restrictions on the map. TFRs are not the whole picture: controlled airspace around airports needs LAANC authorization. Check the FAA’s B4UFLY.

Wind at 400 ft is estimated from the 10 m forecast by the power law, with exponents for each Pasquill stability class (Irwin 1979, rural, as in EPA dispersion models; the class from wind, sun height and cloud, after Turner 1970); gusts keep the ground gust’s margin. Caution from three quarters of your limit; the default 24 mph is the wind resistance printed for common sub-250 g drones. 14 CFR 107.51: “The minimum flight visibility, as observed from the location of the control station must be no less than 3 statute miles” and at least “500 feet below the cloud”. 14 CFR 107.29: “No person may operate a small unmanned aircraft system during periods of civil twilight unless the small unmanned aircraft has lighted anti-collision lighting visible for at least 3 statute miles”; civil twilight is the 30 minutes before sunrise and after sunset, in Alaska the Air Almanac’s. Kp: SWPC’s scales say satellite navigation problems may occur at G3 (Kp 7) and navigation is “degraded for hours” at G4 (Kp 8); Kp 5 is the typical app warning. Typical limits, not rules: rain chance 30% caution and 60% no-fly, thunder 10% and 20%, below 0 °C caution and −10 °C no-fly, over 40 °C caution. Your drone’s manual and the airspace come first.

Spraying and field work

Worked out from the NWS hourly forecast

Hours fit for spraying, and the days dry enough for fieldwork and hay, read from this forecast’s wind, gusts, humidity, temperature and rain.

Spraying windows

  • Sat 8 PM to Sun 12 AM 4 hours, every hour within the rules
  • Sun 11 AM to 4 PM 5 hours, some with delta T between 8 and 10 °C
  • Sun 8 PM to Mon 2 AM 6 hours, every hour within the rules
  • Mon 11 PM to Tue 6 AM 7 hours, every hour within the rules
  • Tue 7 AM to 9 AM 2 hours, every hour within the rules
Sat12 PM6 PM
Sun12 AM6 AM12 PM6 PM
Mon12 AM6 AM12 PM6 PM
Tue12 AM6 AM12 PM6 PM

Good Marginal No

Field days

DayDaytimeChance of rainRainLowest humidityStrongest windDry days in a rowHay drying
SaturdayShowers possible34%0.02 in51%12 mph
SundayDry9%0.00 in46%12 mph1 dGood
MondayShowers possible33%0.00 in49%13 mph
TuesdayDry25%0.00 in51%16 mph2 d
WednesdayDry16%0.01 in53%20 mph1 d
ThursdayWet51%0.38 in53%15 mph
FridayWet45%0.76 in54%10 mph
SaturdayShowers possible44%0.20 in55%10 mph

Spraying: sustained wind 3 to 10 mph, the range US extension services and most labels give; gusts no more than 15 mph (this page’s limit); delta T (air minus wet-bulb temperature) 2 to 8 °C preferred and 8 to 10 °C marginal, from GRDC guidance, with the wet bulb by Stull’s formula; no hour at a 30% chance of rain or 0.25 mm forecast during the rain-free time. Follow the product label, which overrides all of this. Field days: dry is no daytime hour at a 30% chance and under 1 mm all day, wet is 6 mm (0.25 in) or more; soil moisture is not in the forecast, so ground still wet from earlier rain is not accounted for. Hay drying marks a dry day with humidity down to 50% and a breeze of 5 mph or more.

Solunar times

Computed from the moon’s position

The best-rated day this week is Saturday, rated best.

DayRatingMajor periodsMinor periodsMoonSunrise, sunset
Sat Best11:57 PM to 1:57 AM12:19 PM to 2:19 PM6:43 AM to 7:43 AM6:49 PM to 7:49 PM 100%7:20 AM, 7:22 PM
Sun Best12:43 AM to 2:43 AM1:06 PM to 3:06 PM7:43 AM to 8:43 AM7:24 PM to 8:24 PM 99%7:21 AM, 7:21 PM
Mon Good1:31 AM to 3:31 AM1:56 PM to 3:56 PM8:45 AM to 9:45 AM8:02 PM to 9:02 PM 95%7:21 AM, 7:20 PM
Tue Fair2:23 AM to 4:23 AM2:51 PM to 4:51 PM9:50 AM to 10:50 AM8:46 PM to 9:46 PM 90%7:22 AM, 7:19 PM
Wed Poor3:19 AM to 5:19 AM3:49 PM to 5:49 PM10:58 AM to 11:58 AM9:37 PM to 10:37 PM 82%7:22 AM, 7:18 PM
Thu Fair4:19 AM to 6:19 AM4:51 PM to 6:51 PM12:05 PM to 1:05 PM10:35 PM to 11:35 PM 73%7:23 AM, 7:17 PM
Fri Fair5:22 AM to 7:22 AM5:53 PM to 7:53 PM1:09 PM to 2:09 PM 64%7:23 AM, 7:15 PM

Periods in bold fall within an hour of sunrise or sunset. The weather’s side is the fishing index

Major periods are two hours centered on the moon’s passage overhead and underfoot; minor periods are one hour centered on moonrise and moonset: the conventional durations of John Alden Knight’s solunar tables (1936). The rating is this site’s: one point to start, two more within a day and a half of a new or full moon (one more within three and a half days), and one more when a period falls within an hour of sunrise or sunset. The theory has mixed support in fisheries research; the times are exact astronomy.

In words

NWS forecast periods, as issued
  1. This Afternoon96° · 34% · E 8–12 mph

    A chance of rain showers before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then a slight chance of showers and thunderstorms between 3pm and 4pm. Mostly sunny, with a high near 96. Heat index values as high as 106. East wind 8 to 12 mph. Chance of precipitation is 30%.

  2. Tonight79° · 9% · ESE 1–10 mph

    Mostly clear, with a low around 79. East southeast wind 1 to 10 mph.

  3. Sunday97° · 9% · E 1–12 mph

    Mostly sunny. High near 97, with temperatures falling to around 93 in the afternoon. Heat index values as high as 105. East wind 1 to 12 mph.

  4. Sunday Night78° · 4% · ESE 1–12 mph

    Partly cloudy, with a low around 78. East southeast wind 1 to 12 mph.

  5. Monday96° · 33% · ESE 1–13 mph

    A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 96. East southeast wind 1 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

  6. Monday Night80° · 33% · SE 7–12 mph

    A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 80. Southeast wind 7 to 12 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

  7. Tuesday96° · 25% · SSE 7–16 mph

    A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. South southeast wind 7 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

  8. Tuesday Night82° · 25% · SE 17 mph

    A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 82. Southeast wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

  9. Wednesday97° · 16% · SSE 16–20 mph

    A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. South southeast wind 16 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.

  10. Wednesday Night81° · 24% · SE 13–20 mph

    A slight chance of showers and thunderstorms. Partly cloudy, with a low around 81. Southeast wind 13 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.

  11. Thursday95° · 51% · SSE 15 mph

    A slight chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 95. South southeast wind around 15 mph, with gusts as high as 29 mph. Chance of precipitation is 50%.

  12. Thursday Night79° · 51% · SE 6–13 mph

    A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 79. Chance of precipitation is 50%.

  13. Friday94° · 45% · SE 7–10 mph

    A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 94. Chance of precipitation is 50%.

  14. Friday Night78° · 45% · ESE 3–10 mph

    A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 78.

The forecaster’s discussion

NWS Brownsville/Rio Grande Valley, TX · issued Sep 26, 6:09 AM CDT

Written by the forecaster on duty for their own colleagues and for anyone who wants to know why the forecast says what it says. It is not edited for the public, so it uses the office’s shorthand; it is also the most honest thing any weather service publishes.

KEY Messages

Updated at 608 AM CDT Sat Sep 26 2026

Hotter than normal temperatures will continue through Wednesday of next week.

Widespread moderate (level 2 out of 4) to major (level 3 out of 4) heat risk with pockets of Extreme (Level 4 of 4) Heat Risk to continue across the region through Wednesday of next week.

Heat spikes are possible Tuesday/Wednesday of next week with dangerous heat indices ranging between 105-115F degrees.

A welcome weather pattern change to cooler and wetter could take shape at the start of October (sometime mid to late next week).

Our next best and more widespread chances for rain (due to a cool front and nearby shortwave trough) will come mid to late next week; currently have low-medium chances (30-40%) areawide in the Wednesday through Friday timeframe.

Discussion

1049 PM CDT Fri Sep 25 2026

The heat will continue to be the main weather storyline through Wednesday of next week. However, Wednesday through Friday of next week (or as we move into the month of October), the storyline will shift towards the increasing chances for a major weather pattern change towards cooler and wetter conditions, driven by El Nino influences.

We start off the forecast period tonight where most of the diurnally and sea breeze driven rain showers will continue to decrease in coverage across the region giving way to dry, warm, and humid conditions under mostly clear skies.

Saturday through Monday of next week, Deep South Texas and the Rio Grande Valley will remain under the influences of a strong heat ridge, though it will begin weakening. Subsidence from the heat ridge will result in rain-free and hotter than normal temperatures. High temperatures during this time will range between the upper 90s to lower 100s.

Tuesday through Wednesday of next week is when things get interesting regarding our aforementioned pattern shift. Hurricane Polo during this time is expected to make landfall over the Baja Peninsula of California, northern Mexico, and eventually northern Texas. Along with the re-curvature of Hurricane Polo, deep tropical moisture from the Eastern Pacific will stream will begin to stream into the region from the west-southwest. Meanwhile, deep tropical moisture from the Gulf of America will begin to stream into the region from the south, courtesy of a large Bermuda high to the east. The combination of deep tropical moisture streaming in from these two source regions along with the aforementioned heat dome in place (though weakening) could result in a heat spike with high heat indices Tuesday and Wednesday. Increased humidity levels with dewpoints in the mid to upper 70s will result in a return to dangerous peak heat indices ranging between 105-113F degrees Tuesday and Wednesday. This will trigger widespread Major (Level 3 of 4) to Extreme Level 4 of 4) Heat Risk over the region. Special Weather Statements (SPSs) and/or a Heat Advisory may be needed Tuesday and Wednesday.

Additionally, during this time (Tuesday through Wednesday of next week), a southeastward advancing cool front will be traversing across Texas gradually approaching Deep South Texas. Meanwhile, there are indications of a weak shortwave trough and mid-upper energies residing near Deep South Texas and northeast Mexico. The combination of a nearby mid-upper impulses, an approaching cool front, and the influx of deep tropical moisture from both the Gulf of America and the Eastern Equatorial Pacific Ocean will support widespread chances for showers and thunderstorms beginning Wednesday and persisting through then end of next week and possibly longer. This is the potential pattern shift that we've been closely monitoring, and if realized, will bring the breakthrough rains that we've been waiting for so long as well as a notably cooler pattern due to the increase cloud coverage and rains. This potential pattern shift to start October has El Nino written all over it. Again, we will continue to closely monitor forecast trends in the days ahead. Currently, we've have low- medium (30-50%) PoPs Wednesday through Friday areawide. It's too early to get into the exact impacts, but heavy rainfall is possible given the surge of tropical moisture.

Aviation

608 AM CDT Sat Sep 26 2026

(12Z TAFS)

VFR will prevail at the aerodromes through the next 24 hours, with light to moderate winds and clear to partly cloudy skies. A TEMPO for convection has been added based on the HRRR model.

Marine

1049 PM CDT Fri Sep 25 2026

Generally, favorable marine conditions will persist through Monday of next week with low to moderate seas (wave heights between 1-3 feet) and winds. Tuesday/Wednesday and points forward, conditions will become more adverse due to the threat for showers and thunderstorms as well as increased seas. SCEC to Small Craft Advisories may be needed in the Tuesday through Thursday timeframe.

Preliminary Point Temps / Pops

BROWNSVILLE 95 79 96 79 / 30 0 10 0 HARLINGEN 98 74 99 74 / 20 0 10 0 MCALLEN 101 78 102 79 / 20 0 0 0 RIO GRANDE CITY 101 77 102 77 / 0 0 0 0 SOUTH PADRE ISLAND 89 82 89 82 / 30 0 10 0 BAYVIEW/PORT ISABEL 93 77 94 77 / 20 0 0 0

BRO Watches / Warnings / Advisories

None.

The outlooks beyond

SPC, WPC, CPC and the Drought Monitor, read at this point

The national centers each publish a judgment the local grid does not carry. Read here at this exact coordinate.

Severe weather

  1. Day 1 · Sat Sep 26No risk area
  2. Day 2 · Sun Sep 27No risk area
  3. Day 3 · Mon Sep 28General Thunderstorms Risk
  4. Day 4 · Tue Sep 29No risk area
  5. Day 5 · Wed Sep 30No risk area
  6. Day 6 · Thu Oct 1No risk area
  7. Day 7 · Fri Oct 2No risk area
  8. Day 8 · Sat Oct 3No risk area

Rainfall

  1. Day 1 · Sat Sep 26Under 0.01 in
  2. Day 2 · Sun Sep 27Under 0.01 in
  3. Day 3 · Mon Sep 28Under 0.01 in
  4. Day 4-5 · Sep 29–Sep 300.01 in
  5. Day 6-7 · Oct 1–Oct 21.00 in

The rainfall forecast on the map, days 1 to 7

Flash flood risk

  1. Day 1 · Sat Sep 26Below marginal
  2. Day 2 · Sun Sep 27Below marginal
  3. Day 3 · Mon Sep 28Below marginal
  4. Day 4 · Tue Sep 29Below marginal
  5. Day 5 · Wed Sep 30Marginal

Six to fourteen days

  1. Days 6–10 · TemperatureEqual chances
  2. Days 6–10 · PrecipitationEqual chances
  3. Days 8–14 · TemperatureEqual chances
  4. Days 8–14 · PrecipitationEqual chances

Drought

  1. Drought Monitor, map of Sep 22D3 Extreme drought

Drought in this county: the map, the record since 2000 and the outlook

Frost and climate

NOAA 1991-2020 normals, Brownsville

A freeze (32°F or colder) comes in only 26 percent of years here.

Climate of 25.91, -97.53: normals, records and every month

Everything else on the grid

NWS forecast grid · 25 elements

The forecast office edits about sixty fields for every cell of its grid. The common ones are above; these are the rest, as the daily extreme, for anyone who needs the mixing height, the fire danger or the swell.

ElementSatSunMonTueWedThuFriSat
Wet bulb globe temperature max88°89°89°89°89°88°87°87°
Heat index max106°105°106°109°111°107°103°102°
Chance of thunder max21%9%27%25%16%36%29%24%
Mixing height max6,400 ft7,200 ft7,000 ft500 ft
Transport wind max16 mph17 mph18 mph22 mph23 mph23 mph17 mph15 mph
Twenty-foot wind max10 mph10 mph12 mph16 mph17 mph16 mph9 mph9 mph

Against the record

NOAA GHCN · Brownsville International (BRO) · 6.7 mi away

Each forecast day against the same calendar date at the nearest long-record station: the 1991 to 2020 normal, and the record high and low with the year they were set.

DayForecastNormalRecord highRecord low
Sat Sep 2696° / 80°90° / 72°98° (2023)58° (1914)
Sun Sep 2797° / 78°90° / 71°99° (2005)58° (1909)
Mon Sep 2896° / 80°89° / 70°100° (2005)56° (1909)
Tue Sep 2996° / 82°88° / 70°98° (2023)51° (1909)
Wed Sep 3097° / 81° would tie the record89° / 70°97° (2023)54° (1918)
Thu Oct 195° / 79°90° / 71°97° (2023)52° (1920)
Fri Oct 294° / 78°90° / 71°97° (2023)57° (1958)
Sat Oct 392° / 78°89° / 71°98° (2023)57° (1961)

Sun and moon

DayCivil twilightSunriseSunsetCivil twilightDaylightMoon
Sat6:57 AM7:20 AM7:22 PM7:45 PM12 h 2 min Full moon · 100% lit
Sun6:58 AM7:21 AM7:21 PM7:44 PM12 h 0 min Waning gibbous · 99% lit
Mon6:58 AM7:21 AM7:20 PM7:43 PM11 h 59 min Waning gibbous · 95% lit
Tue6:59 AM7:22 AM7:19 PM7:42 PM11 h 57 min Waning gibbous · 90% lit
Wed6:59 AM7:22 AM7:18 PM7:41 PM11 h 56 min Waning gibbous · 82% lit
Thu7:00 AM7:23 AM7:17 PM7:40 PM11 h 54 min Waning gibbous · 73% lit
Fri7:00 AM7:23 AM7:15 PM7:38 PM11 h 52 min Waning gibbous · 64% lit
Sat7:00 AM7:23 AM7:14 PM7:37 PM11 h 51 min Last quarter · 53% lit

Forecast from the National Weather Service forecast grid at api.weather.gov, updated by the local office through the day; the written periods and hourly digest are the NWS’s own. Outlooks from the Storm Prediction Center, the Weather Prediction Center and the Climate Prediction Center via NOAA’s map services. Records and normals from NOAA’s Global Historical Climatology Network. Sun and moon computed here. Place names from GeoNames (CC BY 4.0).

What is here

Seven days
The high, the low, the chance and amount of rain and snow, the wind and the forecaster’s words for each day and night, from the National Weather Service grid for the exact cell your town sits in.
Hour by hour
Temperature, what it feels like, dew point, humidity, chance and amount of precipitation, wind and gusts, sky cover, the chance of thunder, pressure, visibility and ceiling, as a chart and as a table, with nights shaded.
Everything else on the grid
The office edits about sixty fields for every cell. The ones the mainstream forecast pages leave out are here as a daily table: HeatRisk, wet bulb globe temperature, lightning activity, mixing height, transport wind, the fire weather indices, and at the coast the waves and swell.
The discussion
The Area Forecast Discussion the forecaster wrote to explain the forecast, in their own words, with the specialist annexes folded away. Also the office’s hazardous weather outlook.
Beyond the week
The Storm Prediction Center’s severe weather category for each of the next eight days, the Weather Prediction Center’s rainfall forecast to day seven and its winter storm severity, and the Climate Prediction Center’s odds for days six to fourteen, all read at your coordinate.
Against the record
Each forecast day beside the same date at the nearest long-record station: the thirty-year normal and the record high and low with their years, so a forecast high that would break a record says so.
The next 90 days
The forecast as far as the grid, the National Blend and the global models reach, and the calendar after that: the normal and the record for every date, with the Climate Prediction Center’s lean for the weeks, the month and the season drawn over them. No made-up highs for a date three months out.

Common questions

Where does this forecast come from?

From the National Weather Service forecast grid published at api.weather.gov, the same grid the local forecast office edits through the day and the source of every forecast on weather.gov. The written periods, the hourly digest and the forecaster’s discussion are the NWS’s own products, shown as issued. Nothing here is a blend a website made.

How far ahead does it go?

The grid runs seven days ahead, hour by hour for the first days and in three to six hour steps after that. The National Blend of Models carries the days to eleven and the global models to sixteen. Beyond that the page carries the national centers’ outlooks, severe weather to day eight, rainfall to day seven, and the Climate Prediction Center’s odds for the coming weeks, month and season, over a ninety-day calendar of the normal and the record for each date. No forecast has skill day by day past about two weeks, and this page does not print one.

Why is this different from the app on my phone?

Most forecast apps show a blend of models chosen by the company that makes the app. This page shows the forecast the local National Weather Service office issues, edited by the forecasters who will also issue the warnings, and it shows all of it rather than the six numbers that fit on a phone. The discussion explains the reasoning, which no app carries.

What is a place’s address here?

Every town has its own page, such as /forecast/us/oklahoma/oklahoma-city/, and every day at a town has one too. A ZIP code typed into the search goes to the town it belongs to. Any coordinate at all can be looked up, and the page names the nearest town.

What the weather actually was · Open the live radar · Where the data comes from