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

Heavy Rainfall on the Western Gulf Coast; Severe Thunderstorms in the Southern Plains Friday

A multi-day heavy rainfall event will continue over the western Gulf Coast through Monday. Slight Risks of excessive rainfall have been issued, and Flood Watches remain in effect through Monday evening. Scattered severe storms capable of producing large hail and damaging winds are possible across western portions of Texas and Oklahoma on Friday. Read More >

Hazardous Weather Conditions

Current conditions at

Port Lavaca - Calhoun County Airport (KPKV)

Lat: 28.65°NLon: 96.68°WElev: 27ft.

Fair

72°F

22°C

Humidity 100%
Wind Speed SE 5 mph
Barometer 29.85 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 21 May 11:35 pm CDT
Extended Forecast for

Port Lavaca TX

Flood Watch May 21, 11:42pm until May 25, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 21, 11:42pm until May 25, 07:00pm

    NOW until 7:00pm Mon

    Flood Watch

  • Tonight

    Low: 72 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly before 3pm. Mostly sunny, with a high near 86. Heat index values as high as 94. Light south wind increasing to 6 to 11 mph in the morning.

    High: 86 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms between 7pm and 8pm. Partly cloudy, with a low around 75. Southeast wind 6 to 9 mph. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 82. Heat index values as high as 87. Southeast wind 6 to 11 mph. Chance of precipitation is 80%.

    High: 82 °F

    Chance
    T-storms then
    T-storms

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 72. East southeast wind 5 to 9 mph. Chance of precipitation is 80%.

    Low: 72 °F

    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 7am, then showers and thunderstorms likely after 7am. Partly sunny, with a high near 84. Northeast wind 5 to 8 mph becoming south southeast in the afternoon. Chance of precipitation is 70%.

    High: 84 °F

    T-storms
    Likely

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. East wind 3 to 7 mph.

    Low: 72 °F

    Chance
    T-storms

  • Memorial Day

    Memorial Day: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. Northeast wind 5 to 7 mph becoming southeast in the afternoon.

    High: 83 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. South wind 3 to 5 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly before 3pm. Mostly sunny, with a high near 86. Heat index values as high as 94. Light south wind increasing to 6 to 11 mph in the morning.
Friday Night
A slight chance of showers and thunderstorms between 7pm and 8pm. Partly cloudy, with a low around 75. Southeast wind 6 to 9 mph. Chance of precipitation is 20%.
Saturday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 82. Heat index values as high as 87. Southeast wind 6 to 11 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 72. East southeast wind 5 to 9 mph. Chance of precipitation is 80%.
Sunday
Showers likely and possibly a thunderstorm before 7am, then showers and thunderstorms likely after 7am. Partly sunny, with a high near 84. Northeast wind 5 to 8 mph becoming south southeast in the afternoon. Chance of precipitation is 70%.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. East wind 3 to 7 mph.
Memorial Day
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. Northeast wind 5 to 7 mph becoming southeast in the afternoon.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Southeast wind 3 to 8 mph.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76.
Wednesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Port Lavaca TX
 28.62°N 96.64°W
Last Update:
11:26 pm CDT May 21, 2026
Forecast Valid:
11pm CDT May 21, 2026-6pm CDT May 28, 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