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

67°F

19°C

Humidity 96%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 66°F (19°C)
Visibility 7.00 mi
Last update 15 Oct 2:15 am CDT
Extended Forecast for

Donnellson IL

  • Overnight

    Overnight: A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 64. Light east wind.

    Low: 64 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 10am and 11am. High near 79. Light and variable wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 80%.

    High: 79 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 1am, then scattered showers between 1am and 3am. Increasing clouds, with a low around 45. Southwest wind 9 to 16 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    Low: 45 °F

    Showers
    Likely

  • Friday

    Friday: Mostly cloudy through mid morning, then becoming sunny, with a high near 56. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 28 mph.

    High: 56 °F

    Sunny and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 36. North wind 9 to 15 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 35.

    Low: 35 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 64. Light east wind.
Thursday
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 10am and 11am. High near 79. Light and variable wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 80%.
Thursday Night
Showers and thunderstorms likely before 1am, then scattered showers between 1am and 3am. Increasing clouds, with a low around 45. Southwest wind 9 to 16 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Friday
Mostly cloudy through mid morning, then becoming sunny, with a high near 56. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 28 mph.
Friday Night
Partly cloudy, with a low around 36. North wind 9 to 15 mph, with gusts as high as 22 mph.
Saturday
Sunny, with a high near 60.
Saturday Night
Clear, with a low around 35.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 36.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Donnellson IL
 39.04°N 89.5°W (Elev. 554 ft)
Last Update:
1:26 am CDT Oct 15, 2026
Forecast Valid:
2am CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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