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

55°F

13°C

Humidity 23%
Wind Speed N 10 mph
Barometer 30.03 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 16 Nov 12:50 pm CST
Extended Forecast for

Glen Carbon IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 58. Northwest wind 6 to 8 mph.

    High: 58 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 36. North wind around 5 mph becoming calm in the evening.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of rain after 5pm. Increasing clouds, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 59 °F

    Sunny then
    Slight Chance
    Rain

  • Monday Night

    Monday Night: Rain and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 48. Southeast wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers before noon, then a slight chance of rain after noon. Partly sunny, with a high near 69. Southeast wind 7 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 30%.

    High: 69 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance Rain

  • Thursday

    Thursday: Rain likely and possibly a thunderstorm, then rain after noon. High near 66. Chance of precipitation is 80%.

    High: 66 °F

    Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 58. Northwest wind 6 to 8 mph.
Tonight
Mostly clear, with a low around 36. North wind around 5 mph becoming calm in the evening.
Monday
A 20 percent chance of rain after 5pm. Increasing clouds, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Rain and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 48. Southeast wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers before noon, then a slight chance of rain after noon. Partly sunny, with a high near 69. Southeast wind 7 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 30%.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 51.
Wednesday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 65.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 52.
Thursday
Rain likely and possibly a thunderstorm, then rain after noon. High near 66. Chance of precipitation is 80%.
Thursday Night
Rain likely, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 55. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 65.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 42.
Saturday
A 20 percent chance of rain. Partly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon IL
 38.77°N 89.97°W (Elev. 548 ft)
Last Update:
12:21 pm CST Nov 16, 2025
Forecast Valid:
1pm CST Nov 16, 2025-6pm CST Nov 22, 2025
 
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