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

75°F

24°C

Humidity 69%
Wind Speed S 18 G 29 mph
Barometer 29.74 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 10 Mar 6:50 pm CDT
Extended Forecast for

Glen Carbon IL

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 55. South wind 13 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    Low: 55 °F

    Mostly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 3pm, then a slight chance of showers between 3pm and 4pm. Temperature falling to around 48 by 5pm. Breezy, with a southwest wind 16 to 22 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%.

    High: 67 °F⇓

    Breezy.
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a northwest wind 15 to 20 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 30 mph.

    Low: 32 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 54. Northwest wind 5 to 10 mph becoming southwest in the afternoon.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 44. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 44 °F

    Partly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 60.

    High: 60 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 55. South wind 13 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm before 3pm, then a slight chance of showers between 3pm and 4pm. Temperature falling to around 48 by 5pm. Breezy, with a southwest wind 16 to 22 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a northwest wind 15 to 20 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 30 mph.
Thursday
Sunny, with a high near 54. Northwest wind 5 to 10 mph becoming southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 44. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
Partly sunny, with a high near 60.
Friday Night
Mostly cloudy, with a low around 38.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 51.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 64. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 22. Blustery. Chance of precipitation is 30%.
Monday
Sunny, with a high near 35.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Partly sunny, with a high near 42.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon IL
 38.74°N 89.94°W (Elev. 568 ft)
Last Update:
6:00 pm CDT Mar 10, 2026
Forecast Valid:
7pm CDT Mar 10, 2026-6pm CDT Mar 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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