Port Isabel climate

Port Isabel Weather in August

NOAA 1991-2020 normals for Port Isabel, 10.3 km from Port Isabel

Average highs run from 92°F on August 1 to 91°F on August 31, and lows from 77°F to 76°F. Normal precipitation for the month is 1.93 in over about 4 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Port Isabel, in °F, with the record for each date.60708090100110151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
92°F
Average low
77°F
Precipitation
1.93 in
Record high
102°FAug 23, 2010
Record low
69°FAug 29, 2015
Chance of a freeze
0%
Days of 90°F or more
26.6
Daylight
13 h 20 min to 12 h 40 min
Cloud cover
41%
Humidity
80%
Dew point
77°F
Wind
11.9 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 192°F77°F98°F 201273°F 200510%0%
Aug 292°F77°F98°F 200275°F 200510%0%
Aug 392°F77°F100°F 201773°F 201810%0%
Aug 492°F77°F100°F 202373°F 199910%0%
Aug 593°F77°F99°F 202374°F 200110%0%
Aug 693°F77°F99°F 202375°F 199911%0%
Aug 793°F77°F99°F 202374°F 200511%0%
Aug 893°F77°F99°F 202376°F 202011%0%
Aug 993°F77°F99°F 202376°F 200612%0%
Aug 1093°F77°F98°F 201675°F 201512%0%
Aug 1193°F77°F98°F 201674°F 200013%0%
Aug 1293°F77°F99°F 201972°F 200413%0%
Aug 1393°F77°F99°F 201070°F 200414%0%
Aug 1493°F77°F99°F 201071°F 200414%0%
Aug 1593°F77°F98°F 200674°F 200015%0%
Aug 1693°F77°F99°F 201975°F 199915%0%
Aug 1792°F77°F101°F 202373°F 200416%0%
Aug 1892°F77°F100°F 201073°F 200016%0%
Aug 1992°F77°F99°F 201074°F 201317%0%
Aug 2092°F77°F100°F 201073°F 201518%0%
Aug 2192°F77°F98°F 201073°F 201318%0%
Aug 2292°F77°F99°F 201074°F 199919%0%
Aug 2392°F77°F102°F 201073°F 200020%0%
Aug 2492°F77°F99°F 201074°F 200320%0%
Aug 2592°F77°F98°F 201973°F 200821%0%
Aug 2692°F77°F101°F 201774°F 201521%0%
Aug 2791°F76°F98°F 200672°F 200922%0%
Aug 2891°F76°F100°F 202371°F 200123%0%
Aug 2991°F76°F100°F 201269°F 201523%0%
Aug 3091°F76°F99°F 201073°F 201324%0%
Aug 3191°F76°F99°F 201771°F 200924%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Port Isabel, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:55 AM, sunset 8:15 PM
August 31
sunrise 7:09 AM, sunset 7:49 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00417179 (Port Isabel), public domain. Records: NOAA GHCN-Daily, station USW00012957, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.