National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

Port Lavaca - Calhoun County Airport (KPKV)

Lat: 28.65°NLon: 96.68°WElev: 27ft.

Fair

85°F

29°C

Humidity 80%
Wind Speed S 12 mph
Barometer 29.93 in
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 22 Aug 8:15 pm CDT
Extended Forecast for

5 Miles WSW Port O Connor TX

  • Tonight

    Tonight: Mostly clear, with a low around 81. South wind 7 to 13 mph.

    Low: 81 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 91. Heat index values as high as 103. West southwest wind 5 to 10 mph becoming south in the afternoon.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 81. South wind 7 to 10 mph.

    Low: 81 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 90. Heat index values as high as 103. South southwest wind 8 to 10 mph.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 82. South southeast wind around 11 mph.

    Low: 82 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91. South southwest wind 8 to 11 mph.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 82. South southeast wind 9 to 11 mph.

    Low: 82 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91. South southwest wind 8 to 11 mph.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 82. South wind 9 to 11 mph.

    Low: 82 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 81. South wind 7 to 13 mph.
Sunday
Sunny, with a high near 91. Heat index values as high as 103. West southwest wind 5 to 10 mph becoming south in the afternoon.
Sunday Night
Mostly clear, with a low around 81. South wind 7 to 10 mph.
Monday
Sunny, with a high near 90. Heat index values as high as 103. South southwest wind 8 to 10 mph.
Monday Night
Mostly clear, with a low around 82. South southeast wind around 11 mph.
Tuesday
Sunny, with a high near 91. South southwest wind 8 to 11 mph.
Tuesday Night
Clear, with a low around 82. South southeast wind 9 to 11 mph.
Wednesday
Sunny, with a high near 91. South southwest wind 8 to 11 mph.
Wednesday Night
Mostly clear, with a low around 82. South wind 9 to 11 mph.
Thursday
Sunny, with a high near 91.
Thursday Night
Mostly clear, with a low around 82.
Friday
Sunny, with a high near 91.
Friday Night
Mostly clear, with a low around 82.
Saturday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Port O Connor TX
 28.42°N 96.48°W
Last Update:
4:46 pm CDT Aug 22, 2026
Forecast Valid:
8pm CDT Aug 22, 2026-6pm CDT Aug 29, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation