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.

Partly Cloudy

62°F

17°C

Humidity 75%
Wind Speed Calm
Barometer 29.96 in
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 15 Jun 10:35 pm CDT
Extended Forecast for

3 Miles S Donnellson IL

  • Tonight

    Tonight: Mostly clear, with a low around 56. Calm wind becoming south around 5 mph after midnight.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, then becoming sunny during the afternoon, with a high near 78. South wind 6 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 60%.

    High: 78 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 56. West wind 5 to 8 mph becoming calm in the evening.

    Low: 56 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Breezy, with a south wind 5 to 15 mph increasing to 18 to 28 mph.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 68. Breezy, with a west wind 19 to 24 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 90%.

    Low: 68 °F

    Showers and
    Breezy

  • Thursday

    Thursday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 77. Chance of precipitation is 20%.

    High: 77 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 56. Calm wind becoming south around 5 mph after midnight.
Tuesday
Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, then becoming sunny during the afternoon, with a high near 78. South wind 6 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 60%.
Tuesday Night
Partly cloudy, with a low around 56. West wind 5 to 8 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Breezy, with a south wind 5 to 15 mph increasing to 18 to 28 mph.
Wednesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 68. Breezy, with a west wind 19 to 24 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 90%.
Thursday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 77. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 57.
Juneteenth
Sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 59.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Donnellson IL
 39°N 89.47°W (Elev. 600 ft)
Last Update:
9:31 pm CDT Jun 15, 2026
Forecast Valid:
10pm CDT Jun 15, 2026-6pm CDT Jun 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation