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

86°F

30°C

Humidity 75%
Wind Speed S 14 mph
Barometer 29.98 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 29 Jun 10:50 am CDT
Extended Forecast for

Glen Carbon IL

Extreme Heat Warning June 29, 11:36am until July 3, 10:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 29, 11:36am until July 3, 10:00pm

    NOW until 10:00pm Fri

    Extreme Heat Warning

  • Today

    High: 95 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 77. South wind 6 to 13 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97. Heat index values as high as 109. South wind 6 to 10 mph.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76. South wind 5 to 8 mph.

    Low: 76 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 96. South wind 5 to 10 mph.

    High: 96 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 77.

    Low: 77 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 78.

    Low: 78 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 95. Heat index values as high as 109. South wind 10 to 14 mph, with gusts as high as 21 mph.
Tonight
Mostly clear, with a low around 77. South wind 6 to 13 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 97. Heat index values as high as 109. South wind 6 to 10 mph.
Tuesday Night
Clear, with a low around 76. South wind 5 to 8 mph.
Wednesday
Sunny, with a high near 96. South wind 5 to 10 mph.
Wednesday Night
Clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Partly cloudy, with a low around 78.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
Friday Night
Partly cloudy, with a low around 77.
Independence Day
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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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:
9:21 am CDT Jun 29, 2026
Forecast Valid:
11am CDT Jun 29, 2026-6pm CDT Jul 5, 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