National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

78°F

26°C

Humidity 87%
Wind Speed Calm
Barometer 30.12 in (1019.4 mb)
Dewpoint 74°F (23°C)
Visibility 8.00 mi
Heat Index80°F (27°C)
Last update 22 Jun 6:52 am CDT
Extended Forecast for

De Soto IL

Heat Advisory June 22, 07:49am until June 24, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 22, 07:49am until June 24, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Today

    High: 96 °F

    Sunny

  • Tonight

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

    Low: 76 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 95. Heat index values as high as 105. South southwest wind 3 to 6 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. South wind around 6 mph becoming calm in the evening.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 93. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 93 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. Light south wind.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 96. Heat index values as high as 105. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Tonight
Clear, with a low around 76. South wind 5 to 8 mph.
Monday
Sunny, with a high near 95. Heat index values as high as 105. South southwest wind 3 to 6 mph.
Monday Night
Mostly clear, with a low around 76. South wind around 6 mph becoming calm in the evening.
Tuesday
A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 93. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 75. Light south wind.
Wednesday
Sunny, with a high near 94. Calm wind becoming southwest around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 96. South southwest wind 3 to 8 mph.
Thursday Night
Mostly clear, with a low around 76. South southwest wind 3 to 7 mph.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 94. Southwest wind 3 to 8 mph.
Friday Night
A slight chance of showers. Mostly clear, with a low around 75. South southwest wind 3 to 6 mph.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Southwest wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
De Soto IL
 37.81°N 89.23°W
Last Update:
5:15 am CDT Jun 22, 2025
Forecast Valid:
7am CDT Jun 22, 2025-6pm CDT Jun 28, 2025
 
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