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

Heavy Rainfall in the Southern Plains and Mississippi Valley; Thunderstorms in Eastern Colorado on Thursday

A multiple day heavy rainfall event will begin to set up from the Southern Plains into the Mississippi Valley Thursday, peaking in intensity over the holiday weekend. Widely scattered thunderstorms are expected to develop across eastern Colorado Thursday afternoon and evening. Large hail will be the primary hazard. Read More >

Hazardous Weather Conditions

Current conditions at

Port Aransas, Mustang Beach Airport (KRAS)

Lat: 27.81°NLon: 97.09°WElev: 7ft.

Partly Cloudy

80°F

27°C

Humidity 87%
Wind Speed E 9 mph
Barometer 29.97 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 May 11:35 pm CDT
Extended Forecast for

Port Aransas TX

Flood Watch May 21, 01:00am until May 25, 07:00pm
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 77. East wind around 9 mph.

    Low: 77 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 85. Heat index values as high as 92. North wind 7 to 11 mph becoming south southeast in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 4am, then a slight chance of showers between 4am and 5am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 78. South southeast wind 7 to 9 mph. Chance of precipitation is 40%.

    Low: 78 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 87. Heat index values as high as 98. South southeast wind 8 to 13 mph, with gusts as high as 18 mph.

    High: 87 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southeast wind 11 to 13 mph.

    Low: 79 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 86. East southeast wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    High: 86 °F

    Showers
    Likely then
    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 78. East southeast wind 7 to 11 mph. Chance of precipitation is 80%.

    Low: 78 °F

    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South wind 6 to 10 mph becoming east in the afternoon. Chance of precipitation is 70%.

    High: 86 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. East wind 3 to 8 mph.

    Low: 77 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 77. East wind around 9 mph.
Thursday
Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 85. Heat index values as high as 92. North wind 7 to 11 mph becoming south southeast in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
A chance of showers and thunderstorms before 4am, then a slight chance of showers between 4am and 5am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 78. South southeast wind 7 to 9 mph. Chance of precipitation is 40%.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 87. Heat index values as high as 98. South southeast wind 8 to 13 mph, with gusts as high as 18 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southeast wind 11 to 13 mph.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 86. East southeast wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Saturday Night
Showers and possibly a thunderstorm. Low around 78. East southeast wind 7 to 11 mph. Chance of precipitation is 80%.
Sunday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South wind 6 to 10 mph becoming east in the afternoon. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. East wind 3 to 8 mph.
Memorial Day
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 79.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 80.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Aransas TX
 27.82°N 97.06°W
Last Update:
10:31 pm CDT May 20, 2026
Forecast Valid:
11pm CDT May 20, 2026-6pm CDT May 27, 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