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.

Fog/Mist

50°F

10°C

Humidity 88%
Wind Speed SE 6 mph
Barometer 30.09 in
Dewpoint 46°F (8°C)
Visibility 5.00 mi
Wind Chill48°F (9°C)
Last update 20 Nov 10:50 am CST
Extended Forecast for

Glen Carbon IL

  • Today

    Today: A 20 percent chance of rain before 1pm. Cloudy, with a high near 54. Southeast wind around 6 mph.

    High: 54 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: Rain, mainly after 1am. Patchy fog after midnight. Low around 52. East wind 3 to 5 mph. Chance of precipitation is 100%.

    Low: 52 °F

    Chance Rain
    then Rain and
    Patchy Fog

  • Friday

    Friday: Rain and possibly a thunderstorm. Patchy fog before 10am. High near 56. East wind 6 to 8 mph. Chance of precipitation is 100%.

    High: 56 °F

    Rain and
    Patchy Fog
    then Rain
    Likely

  • Friday Night

    Friday Night: Rain, mainly before midnight. Low around 45. North wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 45 °F

    Rain then
    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 58. Northeast wind 3 to 6 mph.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Monday

    Monday: A 50 percent chance of rain. Mostly cloudy, with a high near 58.

    High: 58 °F

    Chance Rain

Detailed Forecast

Today
A 20 percent chance of rain before 1pm. Cloudy, with a high near 54. Southeast wind around 6 mph.
Tonight
Rain, mainly after 1am. Patchy fog after midnight. Low around 52. East wind 3 to 5 mph. Chance of precipitation is 100%.
Friday
Rain and possibly a thunderstorm. Patchy fog before 10am. High near 56. East wind 6 to 8 mph. Chance of precipitation is 100%.
Friday Night
Rain, mainly before midnight. Low around 45. North wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Mostly sunny, with a high near 58. Northeast wind 3 to 6 mph.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Mostly sunny, with a high near 62.
Sunday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 43.
Monday
A 50 percent chance of rain. Mostly cloudy, with a high near 58.
Monday Night
Rain likely. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.
Tuesday
A 40 percent chance of rain. Partly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 51.
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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:
10:56 am CST Nov 20, 2025
Forecast Valid:
11am CST Nov 20, 2025-6pm CST Nov 26, 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