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.

Overcast

79°F

26°C

Humidity 89%
Wind Speed E 10 mph
Barometer 29.91 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 21 May 3:15 am CDT
Extended Forecast for

Port Aransas TX

Flood Watch May 21, 03:33am until May 25, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 21, 03:33am until May 25, 07:00pm

    NOW until 7:00pm Mon

    Flood Watch

  • Overnight

    Low: 77 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms, mainly between 10am and 3pm. 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 quarter and half 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. Partly sunny, with a high near 87. Heat index values as high as 97. South wind 8 to 13 mph.

    High: 87 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southeast wind around 11 mph. Chance of precipitation is 20%.

    Low: 79 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 86. South southeast wind 9 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.

    High: 86 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 78. 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 7 to 9 mph becoming east southeast in the afternoon. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 77. East southeast wind around 9 mph.
Thursday
Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms, mainly between 10am and 3pm. 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 quarter and half 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. Partly sunny, with a high near 87. Heat index values as high as 97. South wind 8 to 13 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southeast wind around 11 mph. Chance of precipitation is 20%.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 86. South southeast wind 9 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Saturday Night
Showers and possibly a thunderstorm. Low around 78. 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 7 to 9 mph becoming east southeast in the afternoon. Chance of precipitation is 60%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. East southeast wind 3 to 8 mph.
Memorial Day
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 86.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 79.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 81.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Aransas TX
 27.82°N 97.06°W
Last Update:
2:56 am CDT May 21, 2026
Forecast Valid:
3am CDT May 21, 2026-6pm CDT May 27, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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