Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

78°F

26°C

Humidity 82%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 5 Sep 12:35 am CDT
Extended Forecast for

Bethalto IL

Extreme Heat Warning September 5, 12:51am until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 5, 12:51am until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Overnight

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 100. Heat index values as high as 107. Calm wind becoming northwest 5 to 7 mph in the morning.

    High: 100 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 70. Northeast wind around 6 mph.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90. East wind 6 to 9 mph.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. East wind 5 to 10 mph.

    Low: 63 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 75. Calm wind.
Saturday
Mostly sunny and hot, with a high near 100. Heat index values as high as 107. Calm wind becoming northwest 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 70. Northeast wind around 6 mph.
Sunday
Mostly sunny, with a high near 90. East wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 63. East wind 5 to 10 mph.
Labor Day
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 64.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Sunny and hot, with a high near 100.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Thursday Night
Partly cloudy, with a low around 66.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.9°N 90.05°W (Elev. 512 ft)
12:26 am CDT Sep 5, 2026
12am CDT Sep 5, 2026-6pm CDT Sep 11, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database