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.

Fair

73°F

23°C

Humidity 61%
Wind Speed SE 5 mph
Barometer 29.95 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 11 Oct 6:50 pm CDT
Extended Forecast for

Glen Carbon IL

  • Tonight

    Tonight: Mostly clear, with a low around 62. South wind 3 to 7 mph.

    Low: 62 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 6 to 11 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 70. Southwest wind 8 to 10 mph.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Southwest wind 7 to 10 mph.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Southwest wind 5 to 7 mph.

    Low: 71 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 90%.

    High: 83 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.

    High: 78 °F

    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 62. South wind 3 to 7 mph.
Columbus Day
Sunny, with a high near 93. Southwest wind 6 to 11 mph.
Monday Night
Mostly clear, with a low around 70. Southwest wind 8 to 10 mph.
Tuesday
Sunny, with a high near 92. Southwest wind 7 to 10 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Southwest wind 5 to 7 mph.
Wednesday
Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Friday
Partly sunny, with a high near 66. Breezy.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 68.
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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:
5:41 pm CDT Oct 11, 2026
Forecast Valid:
7pm CDT Oct 11, 2026-6pm CDT Oct 18, 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