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

59°F

15°C

Humidity 25%
Wind Speed N 7 mph
Barometer 30.00 in (1015.8 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 16 Nov 1:52 pm CST
Extended Forecast for

Grand Tower IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 61. North wind 5 to 8 mph.

    High: 61 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 34. Light north wind.

    Low: 34 °F

    Clear

  • Monday

    Monday: A 20 percent chance of showers after 5pm. Increasing clouds, with a high near 61. Light and variable wind becoming southeast 5 to 9 mph in the morning.

    High: 61 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 49. Southeast wind 6 to 9 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 73. South southwest wind 7 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.

    High: 73 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 51. South southwest wind around 6 mph becoming calm after midnight.

    Low: 51 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 70. Calm wind becoming west northwest around 5 mph.

    High: 70 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 54. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 54 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm before noon, then showers likely. Mostly cloudy, with a high near 70. South wind 5 to 9 mph.

    High: 70 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 61. North wind 5 to 8 mph.
Tonight
Clear, with a low around 34. Light north wind.
Monday
A 20 percent chance of showers after 5pm. Increasing clouds, with a high near 61. Light and variable wind becoming southeast 5 to 9 mph in the morning.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 49. Southeast wind 6 to 9 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 73. South southwest wind 7 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.
Tuesday Night
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 51. South southwest wind around 6 mph becoming calm after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 70. Calm wind becoming west northwest around 5 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 54. Calm wind becoming south southeast around 5 mph after midnight.
Thursday
Showers and possibly a thunderstorm before noon, then showers likely. Mostly cloudy, with a high near 70. South wind 5 to 9 mph.
Thursday Night
Showers. Mostly cloudy, with a low around 57. South wind 7 to 9 mph.
Friday
Showers likely. Partly sunny, with a high near 68. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Friday Night
A chance of showers. Partly cloudy, with a low around 45. South southwest wind 5 to 7 mph becoming west northwest after midnight.
Saturday
A slight chance of showers. Partly sunny, with a high near 58. West wind 5 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:
12:26 pm CST Nov 16, 2025
Forecast Valid:
2pm CST Nov 16, 2025-6pm CST Nov 22, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation