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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

69°F

21°C

Humidity 76%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 20 Jun 4:55 am CDT
Extended Forecast for

4 Miles SE Donnellson IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Today

    Today: Mostly sunny, with a high near 82. Light and variable wind.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. Light and variable wind.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms. High near 80. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

    High: 80 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 7 to 11 mph becoming northwest after midnight. Chance of precipitation is 90%.

    Low: 63 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 76. North wind around 10 mph.

    High: 76 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 82. Light and variable wind.
Tonight
Partly cloudy, with a low around 65. Light and variable wind.
Sunday
Showers and thunderstorms. High near 80. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 7 to 11 mph becoming northwest after midnight. Chance of precipitation is 90%.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 76. North wind around 10 mph.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Partly cloudy, with a low around 61.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Donnellson IL
 38.99°N 89.42°W (Elev. 558 ft)
Last Update:
2:56 am CDT Jun 20, 2026
Forecast Valid:
5am CDT Jun 20, 2026-6pm CDT Jun 26, 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