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

82°F

28°C

Humidity 79%
Wind Speed S 12 mph
Barometer 29.99 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 29 Jun 8:50 am CDT
Extended Forecast for

Bethalto IL

Extreme Heat Warning June 29, 09:51am until July 3, 10:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 29, 09:51am until July 3, 10:00pm

    NOW until 10:00pm Fri

    Extreme Heat Warning

  • Today

    High: 96 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 77. South wind 5 to 11 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97. Heat index values as high as 109. Southwest wind 5 to 10 mph.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75. South wind 3 to 8 mph.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97. Light south wind increasing to 5 to 9 mph in the morning.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly 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 77.

    Low: 77 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 96. Heat index values as high as 109. South wind 9 to 14 mph, with gusts as high as 21 mph.
Tonight
Mostly clear, with a low around 77. South wind 5 to 11 mph.
Tuesday
Sunny and hot, with a high near 97. Heat index values as high as 109. Southwest wind 5 to 10 mph.
Tuesday Night
Clear, with a low around 75. South wind 3 to 8 mph.
Wednesday
Sunny and hot, with a high near 97. Light south wind increasing to 5 to 9 mph in the morning.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Partly cloudy, with a low around 77.
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 95.
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:
Bethalto IL
 38.9°N 90.08°W (Elev. 486 ft)
Last Update:
9:21 am CDT Jun 29, 2026
Forecast Valid:
9am 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