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

86°F

30°C

Humidity 38%
Wind Speed S 9 mph
Barometer 30.15 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 3 Oct 4:50 pm CDT
Extended Forecast for

Glen Carbon ILSimilar City Names

  • Tonight

    Tonight: Clear, with a low around 63. South wind around 6 mph.

    Low: 63 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 87. Light south wind increasing to 6 to 11 mph in the morning.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58. South wind 5 to 8 mph.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 87. South wind 6 to 14 mph, with gusts as high as 21 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. South wind 5 to 9 mph.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Sunny, with a high near 85. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 63. South wind around 6 mph.
Saturday
Sunny, with a high near 87. Light south wind increasing to 6 to 11 mph in the morning.
Saturday Night
Clear, with a low around 58. South wind 5 to 8 mph.
Sunday
Sunny, with a high near 87. South wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 63. South wind 5 to 9 mph.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Sunny, with a high near 85. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 64.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Sunny, with a high near 75.
Wednesday Night
Mostly clear, with a low around 52.
Thursday
Sunny, with a high near 75.
Thursday Night
Mostly clear, with a low around 50.
Friday
Sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon ILSimilar City Names
 38.77°N 89.97°W (Elev. 548 ft)
Last Update:
5:11 pm CDT Oct 3, 2025
Forecast Valid:
5pm CDT Oct 3, 2025-6pm CDT Oct 10, 2025
 
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