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 Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

74°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 29.91 in (1012.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 5 Sep 5:53 am CDT
Extended Forecast for

Madison IL

Extreme Heat Warning September 5, 06:54am until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 5, 06:54am until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Today

    High: 100 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 72. North wind around 6 mph becoming light and variable.

    Low: 72 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. Northeast wind 6 to 9 mph.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. East wind 5 to 9 mph.

    Low: 64 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 90. East wind 3 to 7 mph.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99.

    High: 99 °F

    Hot

  • Tuesday Night

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

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny and hot, with a high near 100. Heat index values as high as 109. Calm wind becoming northwest 5 to 7 mph in the morning.
Tonight
Partly cloudy, with a low around 72. North wind around 6 mph becoming light and variable.
Sunday
Mostly sunny, with a high near 93. Northeast wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 64. East wind 5 to 9 mph.
Labor Day
Sunny, with a high near 90. East wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny and hot, with a high near 99.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 102.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 73.
Thursday
A 50 percent chance of showers. Mostly sunny, with a high near 92.
Thursday Night
Partly cloudy, with a low around 67.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
Madison IL
 38.68°N 90.14°W (Elev. 407 ft)
4:16 am CDT Sep 5, 2026
6am CDT Sep 5, 2026-6pm CDT Sep 11, 2026
 
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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