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

49°F

9°C

Humidity 97%
Wind Speed N 3 mph
Barometer 30.33 in (1026.9 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 9 Oct 12:52 am CDT
Extended Forecast for

Grand Tower IL

  • Overnight

    Overnight: Clear, with a low around 44. Light north northeast wind.

    Low: 44 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 72. East northeast wind 5 to 8 mph.

    High: 72 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 41. Light east wind.

    Low: 41 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 74. Calm wind becoming south around 5 mph in the afternoon.

    High: 74 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 80. Calm wind becoming south 5 to 7 mph in the morning.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 56. South southeast wind 3 to 6 mph.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 44. Light north northeast wind.
Thursday
Sunny, with a high near 72. East northeast wind 5 to 8 mph.
Thursday Night
Clear, with a low around 41. Light east wind.
Friday
Sunny, with a high near 74. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 52. Calm wind.
Saturday
Mostly sunny, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 80. Calm wind becoming south 5 to 7 mph in the morning.
Sunday Night
Mostly clear, with a low around 56. South southeast wind 3 to 6 mph.
Columbus Day
Sunny, with a high near 80. South wind 3 to 6 mph.
Monday Night
Mostly clear, with a low around 58. Light south southeast wind.
Tuesday
Sunny, with a high near 80. Calm wind becoming east 5 to 7 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 57. East wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Tower IL
 37.62°N 89.49°W
Last Update:
12:45 am CDT Oct 9, 2025
Forecast Valid:
1am CDT Oct 9, 2025-6pm CDT Oct 15, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation