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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Port Lavaca - Calhoun County Airport (KPKV)

Lat: 28.65°NLon: 96.68°WElev: 27ft.

A Few Clouds

89°F

32°C

Humidity 73%
Wind Speed S 8 mph
Barometer 30.02 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index105°F (41°C)
Last update 28 Aug 10:35 am CDT
Extended Forecast for

Port Lavaca TX

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 90. Heat index values as high as 108. North wind 5 to 11 mph becoming southeast in the afternoon.

    High: 90 °F

    Sunny then
    Chance
    T-storms

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 80. South southeast wind 6 to 11 mph becoming light and variable after midnight.

    Low: 80 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 90. Heat index values as high as 103. Light and variable wind becoming southeast 9 to 14 mph in the morning.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 80. Southeast wind 6 to 13 mph.

    Low: 80 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 89. Light south wind becoming southeast 9 to 14 mph in the morning.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 81. Southeast wind 8 to 14 mph.

    Low: 81 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 89. South southeast wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon.

    High: 89 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 82. Southeast wind 7 to 15 mph, with gusts as high as 20 mph.

    Low: 82 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 89. Southeast wind 5 to 14 mph, with gusts as high as 18 mph.

    High: 89 °F

    Sunny then
    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 90. Heat index values as high as 108. North wind 5 to 11 mph becoming southeast in the afternoon.
Tonight
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 80. South southeast wind 6 to 11 mph becoming light and variable after midnight.
Saturday
Sunny, with a high near 90. Heat index values as high as 103. Light and variable wind becoming southeast 9 to 14 mph in the morning.
Saturday Night
Clear, with a low around 80. Southeast wind 6 to 13 mph.
Sunday
Sunny, with a high near 89. Light south wind becoming southeast 9 to 14 mph in the morning.
Sunday Night
Mostly clear, with a low around 81. Southeast wind 8 to 14 mph.
Monday
Sunny, with a high near 89. South southeast wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon.
Monday Night
Mostly clear, with a low around 82. Southeast wind 7 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 89. Southeast wind 5 to 14 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 82.
Wednesday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 89.
Wednesday Night
Mostly clear, with a low around 81.
Thursday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Port Lavaca TX
 28.62°N 96.61°W
Last Update:
1:46 am CDT Aug 28, 2026
Forecast Valid:
10am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
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Additional Resources

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Hourly Weather Forecast

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National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation