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.

Fog

57°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 30.20 in (1022.3 mb)
Dewpoint 57°F (14°C)
Visibility 0.25 mi
Last update 4 Oct 6:52 am CDT
Extended Forecast for

Grand Tower IL

  • Today

    Today: Sunny, with a high near 86. Calm wind becoming south southeast 5 to 9 mph in the morning.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 55. South southeast wind 3 to 5 mph.

    Low: 55 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. Light south southeast wind becoming south 5 to 9 mph in the morning.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. South southeast wind 3 to 6 mph.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly sunny, with a high near 84. South southeast wind 3 to 6 mph. Chance of precipitation is 50%.

    High: 84 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, with thunderstorms also possible after 7pm. Partly cloudy, with a low around 64. Light southeast wind. Chance of precipitation is 50%.

    Low: 64 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 80 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 57. North wind around 7 mph.

    Low: 57 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. North northeast wind 7 to 9 mph.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 86. Calm wind becoming south southeast 5 to 9 mph in the morning.
Tonight
Clear, with a low around 55. South southeast wind 3 to 5 mph.
Sunday
Sunny, with a high near 86. Light south southeast wind becoming south 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 63. South southeast wind 3 to 6 mph.
Monday
A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly sunny, with a high near 84. South southeast wind 3 to 6 mph. Chance of precipitation is 50%.
Monday Night
A chance of showers, with thunderstorms also possible after 7pm. Partly cloudy, with a low around 64. Light southeast wind. Chance of precipitation is 50%.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Calm wind becoming west northwest around 6 mph in the afternoon.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 57. North wind around 7 mph.
Wednesday
Mostly sunny, with a high near 75. North northeast wind 7 to 9 mph.
Wednesday Night
Mostly clear, with a low around 49. Northeast wind around 6 mph.
Thursday
Sunny, with a high near 74. East northeast wind 5 to 7 mph.
Thursday Night
Mostly clear, with a low around 49. Light and variable wind.
Friday
Sunny, with a high near 77. Calm wind becoming south southwest around 6 mph in the afternoon.
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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:
4:45 am CDT Oct 4, 2025
Forecast Valid:
7am CDT Oct 4, 2025-6pm CDT Oct 10, 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