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.

A Few Clouds

84°F

29°C

Humidity 58%
Wind Speed N 13 G 22 mph
Barometer 30.03 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 22 Aug 1:52 pm CDT
Extended Forecast for

De Soto IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 86. North northwest wind around 11 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Patchy fog between 4am and 5am. Otherwise, clear, with a low around 63. North wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Clear then
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84. Light and variable wind.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 86. Light east southeast wind. Chance of precipitation is 10%.

    High: 86 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 86. North northwest wind around 11 mph.
Tonight
Patchy fog between 4am and 5am. Otherwise, clear, with a low around 63. North wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 61. Calm wind.
Monday
Mostly sunny, with a high near 84. Light and variable wind.
Monday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.
Tuesday
A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 86. Light east southeast wind. Chance of precipitation is 10%.
Tuesday Night
Partly cloudy, with a low around 66. Calm wind.
Wednesday
Partly sunny, with a high near 88. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 67. Calm wind.
Thursday
Sunny, with a high near 89. Calm wind becoming north northwest 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 66. Light north wind.
Friday
Sunny, with a high near 88. Calm wind becoming north around 5 mph in the afternoon.
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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 pm CDT Aug 22, 2026
Forecast Valid:
2pm CDT Aug 22, 2026-6pm CDT Aug 28, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation