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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

27°F

-3°C

Humidity 59%
Wind Speed S 18 G 25 mph
Barometer 30.03 in
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 24 Feb 7:50 am CST
Extended Forecast for

Glen Carbon IL

  • Today

    Today: Mostly cloudy, with a high near 54. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 33 mph.

    High: 54 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. Southwest wind 5 to 10 mph becoming light and variable after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 52. Light and variable wind becoming northeast around 6 mph in the afternoon.

    High: 52 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 37. East wind 5 to 9 mph. Chance of precipitation is 60%.

    Low: 37 °F

    Rain Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 50. East wind 6 to 9 mph becoming northwest in the afternoon.

    High: 50 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 54. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 33 mph.
Tonight
Mostly cloudy, with a low around 35. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Wednesday
Partly sunny, with a high near 52. Light and variable wind becoming northeast around 6 mph in the afternoon.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 37. East wind 5 to 9 mph. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 50. East wind 6 to 9 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 33.
Friday
Sunny, with a high near 64.
Friday Night
Mostly clear, with a low around 41.
Saturday
Sunny, with a high near 66.
Saturday Night
Partly cloudy, with a low around 32.
Sunday
A chance of rain and snow. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 40%.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 49. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon IL
 38.75°N 89.97°W (Elev. 499 ft)
Last Update:
6:46 am CST Feb 24, 2026
Forecast Valid:
8am CST Feb 24, 2026-6pm CST Mar 2, 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