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

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

60°F

16°C

Humidity 84%
Wind Speed NW 3 mph
Barometer 30.13 in (1020.2 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 25 Aug 7:52 am CDT
Extended Forecast for

De Soto IL

  • Today

    Today: Increasing clouds, with a high near 78. Light north northwest wind increasing to 5 to 9 mph in the morning.

    High: 78 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 51. North northwest wind around 6 mph becoming calm in the evening.

    Low: 51 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 79. Calm wind becoming north northwest 5 to 8 mph in the afternoon.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 51. North wind around 6 mph becoming calm in the evening.

    Low: 51 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80. Calm wind.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers. Partly sunny, with a high near 81. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 81 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 56. Light and variable wind.

    Low: 56 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 83. Northeast wind 3 to 8 mph.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 78. Light north northwest wind increasing to 5 to 9 mph in the morning.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 51. North northwest wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 79. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 51. North wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 80. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 57. Calm wind.
Thursday
A 20 percent chance of showers. Partly sunny, with a high near 81. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 56. Light and variable wind.
Friday
Mostly sunny, with a high near 83. Northeast wind 3 to 8 mph.
Friday Night
Partly cloudy, with a low around 58. East northeast wind 3 to 7 mph.
Saturday
Mostly sunny, with a high near 81. East northeast wind 5 to 8 mph.
Saturday Night
Partly cloudy, with a low around 59. East northeast wind 3 to 6 mph.
Sunday
A slight chance of showers. Mostly sunny, with a high near 80. East 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:
5:31 am CDT Aug 25, 2025
Forecast Valid:
8am CDT Aug 25, 2025-6pm CDT Aug 31, 2025
 
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Additional Resources

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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