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.

Fair

74°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 30.03 in (1016.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 14 Aug 10:52 pm CDT
Extended Forecast for

Grand Tower IL

  • Tonight

    Tonight: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 95. Heat index values as high as 105. Light south wind.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 98. Heat index values as high as 106. Light south wind.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 100. Light south wind.

    High: 100 °F

    Hot

  • Sunday Night

    Sunday Night: Clear, with a low around 75. Calm wind.

    Low: 75 °F

    Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. Light south wind.

    High: 100 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. Light south southeast wind.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 72. Calm wind.
Friday
Sunny, with a high near 95. Heat index values as high as 105. Light south wind.
Friday Night
Mostly clear, with a low around 73. Calm wind.
Saturday
Sunny and hot, with a high near 98. Heat index values as high as 106. Light south wind.
Saturday Night
Mostly clear, with a low around 73. Calm wind.
Sunday
Sunny and hot, with a high near 100. Light south wind.
Sunday Night
Clear, with a low around 75. Calm wind.
Monday
Sunny and hot, with a high near 100. Light south wind.
Monday Night
Mostly clear, with a low around 75. Light south southeast wind.
Tuesday
Sunny and hot, with a high near 100. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light and variable wind.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 95. North wind 3 to 7 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 70. North wind 3 to 6 mph.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 91. North wind 3 to 7 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:
11:16 pm CDT Aug 14, 2025
Forecast Valid:
11pm CDT Aug 14, 2025-6pm CDT Aug 21, 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