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

36°F

2°C

Humidity 65%
Wind Speed S 15 mph
Barometer 29.94 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 5 Feb 2:45 pm CST
Extended Forecast for

Glen Carbon IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 29. South wind 5 to 8 mph becoming west after midnight.

    Low: 29 °F

    Decreasing
    Clouds

  • Friday

    Friday: Partly sunny, with a high near 46. Breezy, with a west wind 10 to 15 mph becoming northwest 16 to 21 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 46 °F

    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 23. Northwest wind 6 to 16 mph, with gusts as high as 28 mph.

    Low: 23 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 35. Northeast wind around 6 mph becoming southeast in the afternoon.

    High: 35 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 25. Southeast wind 6 to 10 mph.

    Low: 25 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 29. South wind 5 to 8 mph becoming west after midnight.
Friday
Partly sunny, with a high near 46. Breezy, with a west wind 10 to 15 mph becoming northwest 16 to 21 mph in the afternoon. Winds could gust as high as 33 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 23. Northwest wind 6 to 16 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 35. Northeast wind around 6 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 25. Southeast wind 6 to 10 mph.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Mostly clear, with a low around 29.
Monday
Sunny, with a high near 55.
Monday Night
Mostly clear, with a low around 40.
Tuesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 63.
Tuesday Night
A 40 percent chance of rain. Cloudy, with a low around 43.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 55.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 36.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon IL
 38.77°N 89.97°W (Elev. 548 ft)
Last Update:
2:42 pm CST Feb 5, 2026
Forecast Valid:
3pm CST Feb 5, 2026-6pm CST Feb 12, 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