Current weather · Sep 26, 4:15 AM CDT

26.2110, -98.1890

80°

Mostly ClearFeels like 84° · Humidity 85%NWS forecast for this hour; no recent station reportForecast by NWS Brownsville/Rio Grande Valley, TX · grid 51,19
High
98°
Low
78°
Rain today
16%
Sunrise
7:23 AM
Sunset
7:25 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 4 AM80°84°75°85%0%E3 mph8 mph15%——
Sat 5 AM79°84°75°86%1%E2 mph8 mph28%1%——
Sat 6 AM78°79°75°90%1%E2 mph7 mph31%1%——
Sat 7 AM79°79°75°88%0%NE2 mph7 mph21%——
Sat 8 AM79°84°76°88%2%ENE2 mph7 mph27%1%——
Sat 9 AM82°91°77°84%3%E3 mph8 mph20%1%——
Sat 10 AM87°98°77°73%6%E5 mph9 mph19%6%——
Sat 11 AM90°101°76°64%5%E6 mph10 mph34%5%——
Sat 12 PM93°104°74°54%4%E6 mph10 mph36%4%——
Sat 1 PM96°105°73°48%12%E6 mph12 mph55%12%——
Sat 2 PM96°105°73°48%12%E6 mph13 mph49%12%——
Sat 3 PM97°106°72°46%14%E7 mph14 mph56%14%——
Sat 4 PMSlight chance of thunderstorms and slight chance of light rain showers96°106°72°46%16%E9 mph17 mph65%16%——
Sat 5 PM95°104°72°48%8%E9 mph18 mph51%8%——
Sat 6 PM94°103°73°50%6%E10 mph20 mph41%6%——
Sat 7 PM91°100°73°57%1%E10 mph20 mph33%1%——
Sat 8 PM88°97°74°62%1%E8 mph18 mph23%1%——
Sat 9 PM86°94°74°68%1%ESE7 mph16 mph13%1%——
Sat 10 PM85°92°74°72%1%ESE6 mph15 mph6%1%——
Sat 11 PM84°91°75°75%0%ESE3 mph12 mph6%——
Sun 12 AM83°90°75°77%0%SE3 mph10 mph7%——
Sun 1 AM82°88°75°79%0%SE2 mph8 mph12%——
Sun 2 AM81°88°75°81%0%SE2 mph8 mph15%——
Sun 3 AM80°85°75°84%0%SE2 mph7 mph14%——
Sun 4 AM80°84°75°85%0%ESE2 mph7 mph31%——
Sun 5 AM79°79°75°86%0%E2 mph7 mph29%——
Sun 6 AM79°79°75°89%0%E2 mph6 mph11%——
Sun 7 AM79°79°75°88%0%E2 mph6 mph11%——
Sun 8 AM79°79°76°89%0%E2 mph6 mph15%——
Sun 9 AM82°90°77°85%0%E2 mph6 mph10%——
Sun 10 AM86°97°77°73%0%ESE3 mph7 mph13%——
Sun 11 AM90°100°75°63%0%ESE3 mph7 mph17%——
Sun 12 PM92°102°74°55%0%ESE3 mph7 mph20%——
Sun 1 PM96°105°72°46%0%ESE3 mph8 mph24%——
Sun 2 PM97°105°71°44%0%E5 mph9 mph42%——
Sun 3 PM98°105°70°42%0%E5 mph10 mph41%——
Sun 4 PM98°106°70°40%0%E6 mph12 mph57%——
Sun 5 PM97°105°70°42%0%ESE8 mph16 mph25%——
Sun 6 PM96°104°71°45%0%ESE9 mph20 mph20%——
Sun 7 PM93°102°73°51%0%ESE12 mph22 mph36%——
Sun 8 PM89°97°73°60%0%ESE9 mph20 mph39%——
Sun 9 PM86°94°74°66%0%ESE8 mph18 mph30%——
Sun 10 PM85°93°74°70%0%SE7 mph17 mph20%——
Sun 11 PM84°92°74°73%0%SE6 mph15 mph21%——
Mon 12 AM83°90°75°75%0%SE6 mph14 mph23%——
Mon 1 AM82°89°75°77%0%SE5 mph12 mph24%——
Mon 2 AM82°88°75°79%0%SE5 mph10 mph24%——
Mon 3 AM81°86°74°81%0%SE3 mph10 mph24%——

The next 16 days

NWS grid published Sep 26, 4:00 AM CDT to day 8, the National Blend of Models to day 10, the mean of GFS, ECMWF, ECMWF AI to day 16
  1. TodaySep 2698°78°Mostly Sunny then Slight Chance Showers And Thunderstorms16%wind 10 mph · gusts 20 mph
  2. SunSep 2799°78°Sunny0%wind 12 mph · gusts 22 mph
  3. MonSep 2899°79°Mostly Sunny10%wind 13 mph · gusts 24 mph
  4. TueSep 2999°81°Mostly Sunny11%wind 17 mph · gusts 30 mph
  5. WedSep 3099°80°Mostly Sunny13%wind 17 mph · gusts 32 mph
  6. ThuOct 196°78°Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms49%0.49 inwind 17 mph · gusts 30 mph
  7. FriOct 294°77°Chance Rain Showers then Chance Showers And Thunderstorms46%0.51 inwind 9 mph · gusts 20 mph
  8. SatOct 393°77°38%0.11 inwind 8 mph · gusts 20 mph
  9. SunOct 492°76°National Blend45%0.29 inwind 10 mph · gusts 21 mph
  10. MonOct 589°73°National Blend50%0.62 inwind 12 mph · gusts 23 mph
  11. TueOct 6~82°70°Model mean
  12. WedOct 7~83°65°Model mean
  13. ThuOct 8~82°69°Model mean
  14. FriOct 9~81°67°Model mean
  15. SatOct 10~83°63°Model mean
  16. SunOct 11~80°61°Model mean

Right now

NWS grid for this hour · UV from the EPA · air quality from AirNow
  • Feels like84°
  • WindE 3 mphgusts 8 mph
  • Radar over this pointno reading
  • Humidity85%
  • Dew point75°
  • Pressure—
  • UV index—
  • Air quality—
  • Visibility—
  • Sunrise and sunsetSunrise · Sunset · not yet up
  • Moonrise7:22 PMMoonset 7:16 AM
  • Moon phaseFull moon100% lit

The National Blend of Models

NOAA NBM v5.0 · run of Sep 26, 1:00 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 2698°78°NWS grid 98° / 78°rain 13%thunder 22%wind 10 mph · gusts 20 mph
  2. SunSep 2799°79°NWS grid 99° / 78°rain 3%thunder 26%wind 12 mph · gusts 22 mph
  3. MonSep 2899°79°NWS grid 99° / 79°rain 8%thunder 26%wind 13 mph · gusts 24 mph
  4. TueSep 2999°81°NWS grid 99° / 81°rain 10%thunder 25%wind 16 mph · gusts 29 mph
  5. WedSep 3099°81°NWS grid 99° / 80°rain 25%thunder 25%wind 17 mph · gusts 32 mph
  6. ThuOct 196°78°NWS grid 96° / 78°rain 49%thunder 27%0.51 inwind 16 mph · gusts 30 mph
  7. FriOct 294°77°NWS grid 94° / 77°rain 46%thunder 33%0.45 inwind 9 mph · gusts 18 mph
  8. SatOct 393°77°NWS grid 93° / 77°rain 38%thunder 27%0.09 inwind 8 mph · gusts 18 mph
  9. SunOct 492°76°Beyond the NWS gridrain 45%0.29 inwind 10 mph · gusts 21 mph
  10. MonOct 589°73°Beyond the NWS gridrain 50%0.62 inwind 12 mph · gusts 23 mph
  11. TueOct 686°—Beyond the NWS gridrain 36%0.30 inwind 13 mph · gusts 25 mph
77°91°104°SunMonTueWedThuFriSat

BlendNWS gridChance of rain, hourly

The models, side by side

HRRR Sep 26, 1:00 AM CDT · GFS Sep 25, 7:00 PM CDT · GEFS Sep 25, 7:00 PM 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 2698° 78°99° 78°98° 80°94° 80°97° 79°0.03 in~95° 78°
Sun Sep 2799° 78°99° 78°97° 81°96° 80°98° 78°~96° 79°
Mon Sep 2899° 79°~83° 82°93° 81°0.02 in95° 80°91° 78°~96° 78°
Tue Sep 2999° 81°—97° 81°0.01 in96° 80°100° 78°~96° 79°
Wed Sep 3099° 80°—99° 82°95° 82°0.08 in99° 81°~97° 83°0.06 in
Thu Oct 196° 78°0.49 in—98° 83°92° 82°0.38 in99° 81°0.05 in~95° 80°1.25 in
Fri Oct 294° 77°0.51 in—95° 81°0.31 in92° 80°0.26 in~96° 82°0.26 in~83° 76°0.89 in
Sat Oct 393° 77°0.11 in—85° 77°0.22 in93° 79°0.06 in~90° 78°0.34 in~86° 76°0.48 in
Sun Oct 4——82° 78°94° 79°0.05 in~82° 74°0.52 in~90° 76°0.03 in
Mon Oct 5——83° 74°0.02 in87° 78°0.10 in~82° 76°0.06 in~89° 76°
Tue Oct 6——~78° 63°—~82° 74°~84° 71°
Wed Oct 7——~82° 64°—~83° 66°~84° 66°
Thu Oct 8——~80° 73°—~82° 71°~86° 63°
Fri Oct 9——~73° 70°—~83° 69°~87° 63°
Sat Oct 10——~75° 58°—~85° 67°~87° 65°
Sun Oct 11——~80° 61°———

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 Mcallen/Miller International (MFE) · 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.

Climate Prediction Center (CPC) temperature lean50%33%warmer 40% · Oct 2026equal chances · Oct to Dec20°40°60°80°100°TodayOct 1Nov 1Dec 1

Forecast high and lowNormal high and lowRecord high and lowCPC leans warmer than normalCPC near normal or equal chances

Week ofNormalWarmest on recordColdest on recordTemperature leanPrecipitation lean
Sep 2691° / 70°104° (2005)52° (1988)no outlookno outlook
Oct 390° / 71°102° (1986)44° (1961)33% chance above normal · days 8 to 1440% chance above normal · days 8 to 14
Oct 1091° / 71°101° (2009)44° (2000)40% chance above normal · Oct 202640% chance above normal · Oct 2026
Oct 1787° / 67°104° (2012)44° (1989)40% chance above normal · Oct 202640% chance above normal · Oct 2026
Oct 2484° / 64°98° (2025)44° (2017)40% chance above normal · Oct 202640% chance above normal · Oct 2026
Oct 3182° / 61°102° (1988)38° (1966)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Nov 781° / 62°96° (1988)38° (2019)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Nov 1479° / 58°96° (2024)33° (2018)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Nov 2176° / 55°96° (1994)33° (1969)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Nov 2876° / 55°99° (2016)32° (1992)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Dec 573° / 54°96° (1977)30° (1978)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Dec 1275° / 53°93° (2019)27° (1966)equal chances · Oct to Dec40% chance above normal · Oct to Dec
Dec 1974° / 53°91° (2015)18° (1989)equal chances · Oct to Dec40% chance above normal · Oct to Dec

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

Outdoors

  • RunningtodayFairhot
  • HikingtodayGoodhot
  • BikingtodayVery goodhot
  • GolftodayVery goodhot
  • FishingtodayIdealfine conditions
  • Boating and paddlingtodayVery goodwind
  • Beach and pooltodayIdealfine conditions
  • CampingtonightIdealfine conditions
  • StargazingtonightFairbright moon

Travel

  • Air travelnext 24 hIdealclear skies
  • Drivingnext 24 hIdealclear roads

Home and garden

  • Lawn mowingtodayVery goodhot
  • GardeningtodayVery goodhot
  • Outdoor entertainingtodayVery goodhot
  • Drying laundry outsidetodayVery goodfine conditions
  • Painting and outdoor projectstodayVery goodhot
  • FrosttonightLowmild

Pests

  • MosquitoestodayVery highwarm
  • TickstodayHighwarm
  • 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
SaturdayFair8:41 PM to 6:07 AM7 of 9None100%Fair7 mph
SundayPoor8:40 PM to 6:07 AM1 of 9None98%Fair8 mph
MondayPoor8:39 PM to 6:08 AM1 of 9None93%Fair12 mph
TuesdayPoor8:38 PM to 6:08 AM0 of 9None87%17 mph
WednesdayPoor8:37 PM to 6:09 AM0 of 9None79%17 mph
ThursdayPoor8:36 PM to 6:09 AM0 of 9None70%9 mph
FridayPoor8:35 PM to 6:09 AM0 of 9None60%6 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
Sat7:00 AM to 7:09 AM7:09 AM to 7:54 AM6:54 PM to 7:39 PM7:39 PM to 7:48 PM
Sun7:00 AM to 7:09 AM7:09 AM to 7:54 AM6:53 PM to 7:38 PM7:38 PM to 7:46 PM
Mon7:01 AM to 7:10 AM7:10 AM to 7:54 AM6:52 PM to 7:36 PM7:36 PM to 7:45 PM
Tue7:01 AM to 7:10 AM7:10 AM to 7:55 AM6:51 PM to 7:35 PM7:35 PM to 7:44 PM
Wed7:02 AM to 7:11 AM7:11 AM to 7:55 AM6:50 PM to 7:34 PM7:34 PM to 7:43 PM
Thu7:02 AM to 7:11 AM7:11 AM to 7:56 AM6:49 PM to 7:33 PM7:33 PM to 7:42 PM
Fri7:03 AM to 7:12 AM7:12 AM to 7:56 AM6:47 PM to 7:32 PM7:32 PM to 7:41 PM
NESWSRSSMRMS
  • SR Sunrise 7:23 AM, 91° E
  • SS Sunset 7:25 PM, 269° W
  • MR Moonrise 7:22 PM, 83° E
  • MS Moonset 7:16 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: fly with caution (gusts near or over your limit, night: lighting and night training required (107.29)). Next good stretch: Sat 8 AM to 1 PM, 5 hours.

Today: civil twilight for Part 107 6:53 AM to sunrise 7:23 AM, and sunset 7:25 PM to 7:55 PM. Anti-collision lighting is required in those minutes and at night.

Sat6 AM12 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 4 AMCaution314180%80°gusts near or over your limit, night: lighting and night training required (107.29)
Sat 5 AMCaution29151%79°night: lighting and night training required (107.29)
Sat 6 AMCaution29141%78°night: lighting and night training required (107.29)
Sat 7 AMCaution2370%79°civil twilight: lighting required (107.29)
Sat 8 AMGood2372%79°nothing against it
Sat 9 AMGood3493%82°nothing against it
Sat 10 AMGood55106%87°nothing against it
Sat 11 AMGood67115%90°nothing against it
Sat 12 PMGood67114%93°nothing against it
Sat 1 PMCaution671312%96°thunderstorms possible
Sat 2 PMCaution671412%96°thunderstorms possible
Sat 3 PMCaution791614%97°thunderstorms possible
Sat 4 PMCaution9122016%96°gusts near or over your limit, thunderstorms possible
Sat 5 PMCaution912218%95°gusts near or over your limit
Sat 6 PMCaution1013236%94°gusts near or over your limit
Sat 7 PMNo-fly1025341%91°wind at 400 ft near or over your limit, gusts near or over your limit, night: lighting and night training required (107.29)
Sat 8 PMNo-fly819301%88°gusts near or over your limit, wind at 400 ft near or over your limit, night: lighting and night training required (107.29)
Sat 9 PMNo-fly717261%86°gusts near or over your limit, night: lighting and night training required (107.29)
Sat 10 PMNo-fly623321%85°gusts near or over your limit, wind at 400 ft near or over your limit, night: lighting and night training required (107.29)
Sat 11 PMCaution314220%84°gusts near or over your limit, night: lighting and night training required (107.29)
Sun 12 AMCaution314210%83°gusts near or over your limit, night: lighting and night training required (107.29)
Sun 1 AMCaution29150%82°night: lighting and night training required (107.29)
Sun 2 AMCaution29150%81°night: lighting and night training required (107.29)
Sun 3 AMCaution29140%80°night: lighting and night training required (107.29)

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 9 AM to 4 PM 7 hours, some with delta T between 8 and 10 °C
  • Sat 10 PM to Sun 1 AM 3 hours, every hour within the rules
  • Sun 10 AM to 3 PM 5 hours, some with delta T between 8 and 10 °C
  • Sun 11 PM to Mon 6 AM 7 hours, every hour within the rules
  • Mon 9 AM to 2 PM 5 hours, some with delta T between 8 and 10 °C
Sat6 AM12 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
SaturdayDry16%0.00 in46%10 mph5 dGood
SundayDry0%0.00 in40%12 mph4 dGood
MondayDry10%0.00 in41%13 mph3 dGood
TuesdayDry11%0.00 in44%15 mph2 dGood
WednesdayDry13%0.00 in47%17 mph1 dGood
ThursdayWet49%0.49 in49%13 mph
FridayWet46%0.51 in50%9 mph
SaturdayShowers possible38%0.11 in52%8 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 Best12:00 AM to 2:00 AM12:22 PM to 2:22 PM6:46 AM to 7:46 AM6:52 PM to 7:52 PM 100%7:23 AM, 7:25 PM
Sun Best12:45 AM to 2:45 AM1:09 PM to 3:09 PM7:46 AM to 8:46 AM7:26 PM to 8:26 PM 99%7:23 AM, 7:23 PM
Mon Good1:34 AM to 3:34 AM1:59 PM to 3:59 PM8:48 AM to 9:48 AM8:05 PM to 9:05 PM 95%7:24 AM, 7:22 PM
Tue Fair2:26 AM to 4:26 AM2:53 PM to 4:53 PM9:54 AM to 10:54 AM8:48 PM to 9:48 PM 90%7:24 AM, 7:21 PM
Wed Poor3:22 AM to 5:22 AM3:52 PM to 5:52 PM11:01 AM to 12:01 PM9:39 PM to 10:39 PM 82%7:25 AM, 7:20 PM
Thu Fair4:22 AM to 6:22 AM4:53 PM to 6:53 PM12:09 PM to 1:09 PM10:37 PM to 11:37 PM 73%7:25 AM, 7:19 PM
Fri Fair5:25 AM to 7:25 AM5:56 PM to 7:56 PM1:13 PM to 2:13 PM 64%7:26 AM, 7:18 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. Overnight78° · 1% · E 3 mph

    Mostly clear, with a low around 78. East wind around 3 mph.

  2. Saturday98° · 16% · E 2–9 mph

    A slight chance of showers and thunderstorms between 4pm and 5pm. Mostly sunny, with a high near 98. Heat index values as high as 106. East wind 2 to 9 mph. Chance of precipitation is 20%.

  3. Saturday Night78° · 6% · ESE 2–10 mph

    Mostly clear, with a low around 78. East southeast wind 2 to 10 mph.

  4. Sunday99° · E 2–8 mph

    Sunny, with a high near 99. Heat index values as high as 106. East wind 2 to 8 mph.

  5. Sunday Night78° · SE 3–12 mph

    Partly cloudy, with a low around 78. Southeast wind 3 to 12 mph, with gusts as high as 22 mph.

  6. Monday99° · 10% · SE 2–10 mph

    Mostly sunny, with a high near 99. Southeast wind 2 to 10 mph.

  7. Monday Night79° · 10% · SE 8–13 mph

    Partly cloudy, with a low around 79. Southeast wind 8 to 13 mph, with gusts as high as 24 mph.

  8. Tuesday99° · 11% · SE 7–15 mph

    Mostly sunny, with a high near 99. Southeast wind 7 to 15 mph, with gusts as high as 28 mph.

  9. Tuesday Night81° · 11% · SE 17 mph

    Partly cloudy, with a low around 81. Southeast wind around 17 mph, with gusts as high as 32 mph.

  10. Wednesday99° · 13% · SE 17 mph

    Mostly sunny, with a high near 99. Southeast wind around 17 mph, with gusts as high as 31 mph.

  11. Wednesday Night80° · 24% · SE 13–17 mph

    A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 80. Southeast wind 13 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

  12. Thursday96° · 49% · SE 13 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 96. Chance of precipitation is 50%.

  13. Thursday Night78° · 49% · SE 7–10 mph

    A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 78. Chance of precipitation is 50%.

  14. Friday94° · 46% · ESE 9 mph

    A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 94.

The forecaster’s discussion

NWS Brownsville/Rio Grande Valley, TX · issued Sep 26, 12:04 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 1201 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

1201 AM CDT Sat Sep 26 2026

(06Z TAFS)

VFR will prevail at the aerodromes through the next 24 hours, with light to moderate winds and clear to partly cloudy skies. Convection appears to be more limited than in the past several days, and is excluded from the TAFs for this cycle.

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

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 · Temperature50% chance above normalOct 1–Oct 5
  2. Days 6–10 · Precipitation50% chance above normalOct 1–Oct 5
  3. Days 8–14 · Temperature33% chance above normalOct 3–Oct 9
  4. Days 8–14 · Precipitation40% chance above normalOct 3–Oct 9

Hazards, 3 to 14 days

  1. Sep 28–Oct 2Severe Drought

Drought

  1. Drought Monitor, map of Sep 22D2 Severe drought
  2. Outlook for Sep 2026Drought persists

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

Frost and climate

NOAA 1991-2020 normals, Mcallen

A freeze (32°F or colder) comes in only 48 percent of years here.

Climate of 26.21, -98.19: 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
HeatRisk max3 · Major3 · Major3 · Major3 · Major3 · Major3 · Major2 · Moderate2 · Moderate
Wet bulb globe temperature max89°90°90°91°90°89°87°87°
Heat index max106°106°107°110°112°106°101°101°
Chance of thunder max16%0%10%11%13%39%30%22%
Mixing height max8,000 ft8,000 ft7,800 ft1,000 ft
Transport wind max20 mph18 mph22 mph23 mph25 mph22 mph18 mph16 mph
Twenty-foot wind max9 mph10 mph12 mph16 mph16 mph16 mph8 mph7 mph

Against the record

NOAA GHCN · Mcallen/Miller International (MFE) · 3.9 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 2698° / 78°92° / 72°103° (2011)58° (1991)
Sun Sep 2799° / 78°92° / 71°102° (1966)55° (1970)
Mon Sep 2899° / 79°92° / 71°104° (2005)55° (1970)
Tue Sep 2999° / 81°91° / 70°101° (2005)56° (1984)
Wed Sep 3099° / 80°91° / 71°101° (1986)54° (2020)
Thu Oct 196° / 78°92° / 70°101° (1986)53° (1992)
Fri Oct 294° / 77°92° / 72°103° (1986)52° (1988)
Sat Oct 393° / 77°92° / 72°102° (1986)44° (1961)

Sun and moon

DayCivil twilightSunriseSunsetCivil twilightDaylightMoon
Sat7:00 AM7:23 AM7:25 PM7:48 PM12 h 2 min Full moon · 100% lit
Sun7:00 AM7:23 AM7:23 PM7:46 PM12 h 0 min Waning gibbous · 99% lit
Mon7:01 AM7:24 AM7:22 PM7:45 PM11 h 58 min Waning gibbous · 95% lit
Tue7:01 AM7:24 AM7:21 PM7:44 PM11 h 57 min Waning gibbous · 90% lit
Wed7:02 AM7:25 AM7:20 PM7:43 PM11 h 55 min Waning gibbous · 82% lit
Thu7:02 AM7:25 AM7:19 PM7:42 PM11 h 54 min Waning gibbous · 73% lit
Fri7:03 AM7:26 AM7:18 PM7:41 PM11 h 52 min Waning gibbous · 64% lit
Sat7:03 AM7:26 AM7:17 PM7:40 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