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.

Fog

69°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 30.15 in (1020.7 mb)
Dewpoint 69°F (21°C)
Visibility 0.50 mi
Last update 5 Aug 6:52 am CDT
Extended Forecast for

Grand Tower IL

  • Today

    Today: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy dense fog before 8am. Otherwise, sunny, with a high near 90. Calm wind.

    High: 90 °F

    Patchy Dense
    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 92. Light southeast wind.

    High: 92 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 70. Light southeast wind.

    Low: 70 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 92. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 71. Southeast wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 92. South wind 3 to 7 mph.

    High: 92 °F

    Sunny

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 87. Light and variable wind.
Tonight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 67. Calm wind.
Wednesday
Patchy dense fog before 8am. Otherwise, sunny, with a high near 90. Calm wind.
Wednesday Night
Mostly clear, with a low around 68. Calm wind.
Thursday
Sunny, with a high near 92. Light southeast wind.
Thursday Night
Clear, with a low around 70. Light southeast wind.
Friday
Sunny, with a high near 92. Calm wind becoming south southeast around 6 mph in the afternoon.
Friday Night
Clear, with a low around 71. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 92. South wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 72. South southeast wind 3 to 6 mph.
Sunday
Mostly sunny, with a high near 92. South wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 73. South wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. South southwest wind 3 to 6 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Tower IL
 37.64°N 89.52°W
Last Update:
4:31 am CDT Aug 5, 2025
Forecast Valid:
7am CDT Aug 5, 2025-6pm CDT Aug 11, 2025
 
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