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

67°F

19°C

Humidity 81%
Wind Speed NW 3 mph
Barometer 30.13 in (1020.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 30 Sep 8:52 am CDT
Extended Forecast for

Grand Tower IL

  • Today

    Today: Sunny, with a high near 90. Calm wind becoming northeast 5 to 7 mph in the afternoon.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. East northeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. Calm wind becoming east around 6 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 62. East wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 89. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86. Calm wind becoming south southwest around 6 mph in the morning.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 58. Light south wind.

    Low: 58 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 84. Calm wind becoming south 5 to 7 mph in the morning.

    High: 84 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 90. Calm wind becoming northeast 5 to 7 mph in the afternoon.
Tonight
Mostly clear, with a low around 60. East northeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 88. Calm wind becoming east around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 62. East wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 89. Calm wind becoming south southeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 61. Calm wind.
Friday
Sunny, with a high near 86. Calm wind becoming south southwest around 6 mph in the morning.
Friday Night
Clear, with a low around 58. Light south wind.
Saturday
Sunny, with a high near 84. Calm wind becoming south 5 to 7 mph in the morning.
Saturday Night
Clear, with a low around 58. South southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 84. South southeast wind 3 to 8 mph.
Sunday Night
Mostly clear, with a low around 60. Southeast wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 85. Calm wind becoming south southeast around 6 mph in the morning.
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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:
8:46 am CDT Sep 30, 2025
Forecast Valid:
8am CDT Sep 30, 2025-6pm CDT Oct 6, 2025
 
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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