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

70°F

21°C

Humidity 33%
Wind Speed S 10 mph
Barometer 30.06 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 14 May 2:50 pm CDT
Extended Forecast for

2 Miles ENE Glen Carbon IL

  • Tonight

    Tonight: A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 55. Southeast wind 8 to 10 mph. Chance of precipitation is 30%.

    Low: 55 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers and thunderstorms likely before 10am, then a slight chance of showers between 10am and 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. South wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 66. South wind around 10 mph.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Southwest wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 89. Breezy.

    High: 89 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Clear, with a low around 70.

    Low: 70 °F

    Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Breezy.

    High: 89 °F

    Breezy.
    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Breezy.

    Low: 72 °F

    Chance
    T-storms and
    Breezy

Detailed Forecast

Tonight
A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 55. Southeast wind 8 to 10 mph. Chance of precipitation is 30%.
Friday
Showers and thunderstorms likely before 10am, then a slight chance of showers between 10am and 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. South wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 66. South wind around 10 mph.
Saturday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Southwest wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 30%.
Sunday
Sunny, with a high near 89. Breezy.
Sunday Night
Clear, with a low around 70.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Breezy.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Breezy.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 70%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Glen Carbon IL
 38.77°N 89.94°W (Elev. 564 ft)
Last Update:
3:01 pm CDT May 14, 2026
Forecast Valid:
3pm CDT May 14, 2026-6pm CDT May 21, 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