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.

Partly Cloudy

81°F

27°C

Humidity 74%
Wind Speed Calm
Barometer 29.98 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 25 Jun 2:50 pm CDT
Extended Forecast for

Glen Carbon IL

Flood Watch June 25, 02:54pm until June 26, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 25, 02:54pm until June 26, 07:00am

    NOW until 7:00am Fri

    Flood Watch

  • This Afternoon

    High: 85 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms, mainly after midnight. Low around 69. Southeast wind 3 to 6 mph. Chance of precipitation is 90%.

    Low: 69 °F

    Chance
    T-storms then
    T-storms

  • Friday

    Friday: Showers and thunderstorms. High near 81. Southeast wind 8 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%.

    High: 81 °F

    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 68. Southwest wind 5 to 8 mph becoming light and variable after midnight.

    Low: 68 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Light and variable wind becoming south around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 84 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

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

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Light and variable wind.
Tonight
Showers and thunderstorms, mainly after midnight. Low around 69. Southeast wind 3 to 6 mph. Chance of precipitation is 90%.
Friday
Showers and thunderstorms. High near 81. Southeast wind 8 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Friday Night
A 50 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 68. Southwest wind 5 to 8 mph becoming light and variable after midnight.
Saturday
A slight chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Light and variable wind becoming south around 5 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
Sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 97.
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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:
1:36 pm CDT Jun 25, 2026
Forecast Valid:
2pm CDT Jun 25, 2026-6pm CDT Jul 1, 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