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

64°F

18°C

Humidity 84%
Wind Speed Calm
Barometer 30.17 in (1021.2 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 23 Jun 10:52 pm CDT
Extended Forecast for

De Soto IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. Calm wind becoming south around 6 mph in the morning.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms before 4am, then a slight chance of showers after 5am. Partly cloudy, with a low around 66. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 87. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 87 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 69. Light south wind. Chance of precipitation is 90%.

    Low: 69 °F

    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 7am. High near 84. West southwest wind 5 to 10 mph. Chance of precipitation is 80%.

    High: 84 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. South southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 72 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 88. South southwest wind 3 to 7 mph.

    High: 88 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 3 to 6 mph.

    Low: 73 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, with a low around 62. Calm wind.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming south around 6 mph in the morning.
Wednesday Night
A slight chance of showers and thunderstorms before 4am, then a slight chance of showers after 5am. Partly cloudy, with a low around 66. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Thursday
A chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 87. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
Showers and possibly a thunderstorm. Low around 69. Light south wind. Chance of precipitation is 90%.
Friday
Showers, with thunderstorms also possible after 7am. High near 84. West southwest wind 5 to 10 mph. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. South southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. South southwest wind 3 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 3 to 6 mph.
Sunday
Mostly sunny, with a high near 94. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 75. South southwest wind 6 to 10 mph.
Monday
Sunny, with a high near 96. South southwest wind 5 to 11 mph.
Monday Night
Clear, with a low around 76. South wind 3 to 8 mph.
Tuesday
Sunny and hot, with a high near 98. South southwest wind 3 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
De Soto IL
 37.81°N 89.23°W
Last Update:
10:16 pm CDT Jun 23, 2026
Forecast Valid:
11pm CDT Jun 23, 2026-6pm CDT Jun 30, 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