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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Port Lavaca - Calhoun County Airport (KPKV)

Lat: 28.65°NLon: 96.68°WElev: 27ft.

Fair

88°F

31°C

Humidity 70%
Wind Speed Vrbl 6 mph
Barometer 29.99 in
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 19 Sep 11:15 am CDT
Extended Forecast for

10 Miles SSW Port O Connor TX

  • Today

    Today: Sunny, with a high near 88. Heat index values as high as 98. East wind 7 to 10 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 80. East southeast wind 6 to 10 mph.

    Low: 80 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 88. Heat index values as high as 100. Light east southeast wind increasing to 5 to 9 mph in the morning.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 81. Southeast wind 6 to 9 mph.

    Low: 81 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 89. East southeast wind 5 to 9 mph.

    High: 89 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 80. East southeast wind 5 to 9 mph becoming light southeast after midnight.

    Low: 80 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 90. Light east wind becoming east southeast 5 to 9 mph in the morning.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 81. East southeast wind 5 to 9 mph becoming light after midnight.

    Low: 81 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90. Northeast wind 6 to 13 mph.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 88. Heat index values as high as 98. East wind 7 to 10 mph.
Tonight
Mostly clear, with a low around 80. East southeast wind 6 to 10 mph.
Sunday
Sunny, with a high near 88. Heat index values as high as 100. Light east southeast wind increasing to 5 to 9 mph in the morning.
Sunday Night
Partly cloudy, with a low around 81. Southeast wind 6 to 9 mph.
Monday
Sunny, with a high near 89. East southeast wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 80. East southeast wind 5 to 9 mph becoming light southeast after midnight.
Tuesday
Sunny, with a high near 90. Light east wind becoming east southeast 5 to 9 mph in the morning.
Tuesday Night
Mostly clear, with a low around 81. East southeast wind 5 to 9 mph becoming light after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90. Northeast wind 6 to 13 mph.
Wednesday Night
Mostly clear, with a low around 81.
Thursday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 89.
Thursday Night
Partly cloudy, with a low around 80.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
10 Miles SSW Port O Connor TX
 28.33°N 96.48°W
Last Update:
10:41 am CDT Sep 19, 2026
Forecast Valid:
11am CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
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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