Heat and Fire Weather Concerns West; Heavy Rain and Thunderstorms from Plains to mid-Atlantic

Thunderstorms and locally heavy rainfall is expected from the Central Plains to the Ohio Valley, mid-Atlantic and across the Southeast. Severe weather from the Upper Midwest to Central Plains increases on Friday. Major to Extreme HeatRisk continues across the Southern Plains to the lower Mississippi Valley late this week. Fire weather concerns for the northern Rockies and northern Plains today. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

75°F

24°C

Humidity 83%
Wind Speed Calm
Barometer 29.98 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 10 Sep 6:45 pm CDT
Extended Forecast for

Donnellson IL

  • Tonight

    Tonight: Patchy fog after 2am.  Otherwise, mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: A 20 percent chance of showers after 2pm.  Patchy fog before 8am.  Otherwise, mostly cloudy, with a high near 81. Light and variable wind.

    High: 81 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 87 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm.  Mostly sunny, with a high near 87. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 64. Calm wind.
Friday
A 20 percent chance of showers after 2pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 81. Light and variable wind.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 65. Calm wind.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 66. Calm wind.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 63.
Monday
Mostly sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 67.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Wednesday
A 50 percent chance of showers. Mostly sunny, with a high near 85.
Wednesday Night
A 40 percent chance of showers. The rain could be heavy at times. Partly cloudy, with a low around 64.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
Donnellson IL
 39.04°N 89.47°W (Elev. 610 ft)
5:41 pm CDT Sep 10, 2026
7pm CDT Sep 10, 2026-6pm CDT Sep 17, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database