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

53°F

12°C

Humidity 96%
Wind Speed NW 3 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 11 Oct 5:52 am CDT
Extended Forecast for

De Soto IL

  • Today

    Today: Sunny, with a high near 85. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. Light south wind.

    Low: 60 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Partly sunny, then gradually becoming sunny, with a high near 91. Southwest wind 5 to 11 mph.

    High: 91 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 66. Southwest wind around 8 mph.

    Low: 66 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Southwest wind 7 to 10 mph.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69. South southwest wind 3 to 5 mph.

    Low: 69 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. West southwest wind 3 to 7 mph. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Northeast wind 3 to 5 mph.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. East wind 7 to 9 mph becoming south southwest in the afternoon.

    High: 82 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 85. Calm wind becoming northwest around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 60. Light south wind.
Columbus Day
Partly sunny, then gradually becoming sunny, with a high near 91. Southwest wind 5 to 11 mph.
Monday Night
Clear, with a low around 66. Southwest wind around 8 mph.
Tuesday
Sunny, with a high near 92. Southwest wind 7 to 10 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69. South southwest wind 3 to 5 mph.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. West southwest wind 3 to 7 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Northeast wind 3 to 5 mph.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. East wind 7 to 9 mph becoming south southwest in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. South southwest wind 5 to 8 mph becoming west northwest after midnight.
Friday
A slight chance of showers. Partly sunny, with a high near 70. Northwest wind 11 to 16 mph, with gusts as high as 22 mph.
Friday Night
Partly cloudy, with a low around 42. North northwest wind 8 to 15 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny, with a high near 61. North wind 10 to 14 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
De Soto IL
 37.81°N 89.23°W
Last Update:
4:56 am CDT Oct 11, 2026
Forecast Valid:
6am CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
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