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

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

73°F

23°C

Humidity 96%
Wind Speed E 3 mph
Barometer 29.92 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 27 Jun 12:15 am CDT
Extended Forecast for

Donnellson IL

  • Overnight

    Overnight: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Patchy fog after 1am. Otherwise, mostly cloudy, with a steady temperature around 70. Calm wind. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 81. Calm wind becoming west around 6 mph in the morning.

    High: 81 °F

    Areas Fog
    then Mostly
    Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly after midnight. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 69. Southeast wind 3 to 6 mph.

    Low: 69 °F

    Chance
    T-storms and
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 90. Heat index values as high as 103. South wind 6 to 9 mph.

    High: 90 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. South wind 5 to 8 mph.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Overnight
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Patchy fog after 1am. Otherwise, mostly cloudy, with a steady temperature around 70. Calm wind. Chance of precipitation is 30%.
Saturday
Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 81. Calm wind becoming west around 6 mph in the morning.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly after midnight. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 69. Southeast wind 3 to 6 mph.
Sunday
Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 90. Heat index values as high as 103. South wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 73. South wind 5 to 8 mph.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Sunny, with a high near 93.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
Sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 74.
Friday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Donnellson IL
 39.04°N 89.47°W (Elev. 610 ft)
Last Update:
10:31 pm CDT Jun 26, 2026
Forecast Valid:
12am CDT Jun 27, 2026-6pm CDT Jul 3, 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