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.

Overcast with Haze

28°F

-2°C

Humidity 75%
Wind Speed N 8 mph
Barometer 30.29 in (1026.0 mb)
Dewpoint 21°F (-6°C)
Visibility 6.00 mi
Wind Chill20°F (-7°C)
Last update 4 Feb 2:52 am CST
Extended Forecast for

De Soto IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 22. North wind around 7 mph.

    Low: 22 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 32. North wind 6 to 10 mph.

    High: 32 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14. North wind 5 to 7 mph becoming calm in the evening.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 35. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 35 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 28. West southwest wind 6 to 8 mph.

    Low: 28 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 49. West southwest wind 6 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26. North northwest wind 3 to 7 mph.

    Low: 26 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 41. Light and variable wind becoming northeast around 6 mph in the morning.

    High: 41 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. South wind around 6 mph.

    Low: 28 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 22. North wind around 7 mph.
Wednesday
Partly sunny, with a high near 32. North wind 6 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 14. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 35. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 28. West southwest wind 6 to 8 mph.
Friday
Mostly sunny, with a high near 49. West southwest wind 6 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Partly cloudy, with a low around 26. North northwest wind 3 to 7 mph.
Saturday
Sunny, with a high near 41. Light and variable wind becoming northeast around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 28. South wind around 6 mph.
Sunday
Mostly sunny, with a high near 51. South wind 5 to 8 mph becoming north in the afternoon.
Sunday Night
Partly cloudy, with a low around 29. Light north northeast wind.
Monday
Mostly sunny, with a high near 51. Calm wind becoming south southwest around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 37. South wind around 6 mph.
Tuesday
A slight chance of showers. Partly sunny, with a high near 58. South wind 6 to 9 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:
1:26 am CST Feb 4, 2026
Forecast Valid:
3am CST Feb 4, 2026-6pm CST Feb 10, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation