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

37°F

3°C

Humidity 60%
Wind Speed Vrbl 3 mph
Barometer 30.17 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 2 Feb 12:50 pm CST
Extended Forecast for

Glen Carbon IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 37. West wind around 5 mph becoming calm.

    High: 37 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of freezing rain before 4am, then a slight chance of snow between 4am and 5am, then a slight chance of freezing rain after 5am. Mostly cloudy, with a low around 27. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 20%.

    Low: 27 °F

    Mostly Cloudy
    then Slight
    Chance Wintry
    Mix

  • Tuesday

    Tuesday: A chance of freezing rain before 7am, then a chance of snow between 7am and 11am. Mostly cloudy, with a high near 34. North wind 6 to 10 mph. Chance of precipitation is 30%.

    High: 34 °F

    Chance Wintry
    Mix then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 17. North wind 3 to 6 mph.

    Low: 17 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 29. North wind 3 to 6 mph.

    High: 29 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 37. West wind around 5 mph becoming calm.
Tonight
A slight chance of freezing rain before 4am, then a slight chance of snow between 4am and 5am, then a slight chance of freezing rain after 5am. Mostly cloudy, with a low around 27. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 20%.
Tuesday
A chance of freezing rain before 7am, then a chance of snow between 7am and 11am. Mostly cloudy, with a high near 34. North wind 6 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 17. North wind 3 to 6 mph.
Wednesday
Mostly sunny, with a high near 29. North wind 3 to 6 mph.
Wednesday Night
Mostly clear, with a low around 14.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Mostly clear, with a low around 31.
Friday
Mostly sunny, with a high near 47.
Friday Night
Mostly clear, with a low around 23.
Saturday
Mostly sunny, with a high near 37.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon IL
 38.77°N 89.94°W (Elev. 564 ft)
Last Update:
12:26 pm CST Feb 2, 2026
Forecast Valid:
1pm CST Feb 2, 2026-6pm CST Feb 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation