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.

Partly Cloudy

88°F

31°C

Humidity 68%
Wind Speed SW 16 G 22 mph
Barometer 30.02 in (1016.2 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 21 Jun 10:52 am CDT
Extended Forecast for

De Soto IL

Heat Advisory June 21, 12:00pm until June 24, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Sunny, with a high near 95. Heat index values as high as 106. South southwest wind around 14 mph, with gusts as high as 22 mph.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 75. South wind 6 to 10 mph.

    Low: 75 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96. South southwest wind 6 to 10 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 76. South wind 5 to 7 mph.

    Low: 76 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 94. South southwest wind 3 to 7 mph.

    High: 94 °F

    Sunny

  • Monday Night

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

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Calm wind becoming south around 5 mph in the afternoon.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. South wind around 5 mph becoming calm in the evening.

    Low: 75 °F

    Mostly Clear

  • Wednesday

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

    High: 94 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 106. South southwest wind around 14 mph, with gusts as high as 22 mph.
Tonight
Clear, with a low around 75. South wind 6 to 10 mph.
Sunday
Sunny, with a high near 96. South southwest wind 6 to 10 mph.
Sunday Night
Clear, with a low around 76. South wind 5 to 7 mph.
Monday
Sunny, with a high near 94. South southwest wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 93. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 75. South wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 94. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 76. South wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 94. Southwest wind 3 to 8 mph.
Thursday Night
Mostly clear, with a low around 75. South southwest wind 3 to 7 mph.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Southwest wind 3 to 8 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:
11:15 am CDT Jun 21, 2025
Forecast Valid:
11am CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation