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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

De Soto IL

  • Overnight

    Overnight: Clear, with a low around 48. Calm wind.

    Low: 48 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 83. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 61. Light south southeast wind.

    Low: 61 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. Light southeast wind becoming south 5 to 9 mph in the morning.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67. South wind 5 to 7 mph.

    Low: 67 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 89. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 89 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 67. South wind 3 to 5 mph.

    Low: 67 °F

    Chance
    Showers

  • Friday

    Friday: Showers likely. Mostly cloudy, with a high near 79. South southwest wind 5 to 8 mph becoming north in the afternoon.

    High: 79 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers. Mostly cloudy, with a low around 59. North northeast wind 5 to 8 mph.

    Low: 59 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 48. Calm wind.
Tuesday
Sunny, with a high near 83. Calm wind becoming south southeast around 5 mph in the afternoon.
Tuesday Night
Increasing clouds, with a low around 61. Light south southeast wind.
Wednesday
Mostly sunny, with a high near 88. Light southeast wind becoming south 5 to 9 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 67. South wind 5 to 7 mph.
Thursday
Partly sunny, with a high near 89. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.
Thursday Night
A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 67. South wind 3 to 5 mph.
Friday
Showers likely. Mostly cloudy, with a high near 79. South southwest wind 5 to 8 mph becoming north in the afternoon.
Friday Night
A chance of showers. Mostly cloudy, with a low around 59. North northeast wind 5 to 8 mph.
Saturday
A chance of showers. Mostly cloudy, with a high near 71. Northeast wind around 7 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 59. Light northeast wind.
Sunday
A slight chance of showers. Partly sunny, with a high near 72. North wind 5 to 10 mph.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 52. North wind around 6 mph.
Monday
Sunny, with a high near 71. Northeast wind 5 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:
1:25 am CDT Sep 29, 2026
Forecast Valid:
3am CDT Sep 29, 2026-6pm CDT Oct 5, 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