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

66°F

19°C

Humidity 73%
Wind Speed S 14 mph
Barometer 29.94 in (1013.7 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 14 Nov 8:52 pm CST
Extended Forecast for

Grand Tower IL

  • Tonight

    Tonight: Partly cloudy, with a low around 58. South southwest wind 8 to 10 mph.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 75. Southwest wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 75 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 46. Southwest wind around 7 mph becoming north after midnight.

    Low: 46 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 61. North wind 3 to 6 mph.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming east southeast 5 to 8 mph in the morning.

    High: 60 °F

    Mostly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 48. Southeast wind around 8 mph. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A slight chance of showers before noon. Partly sunny, with a high near 67. South wind 7 to 9 mph becoming north in the afternoon.

    High: 67 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 40. North wind 3 to 6 mph.

    Low: 40 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 58. South southwest wind 8 to 10 mph.
Saturday
Mostly sunny, with a high near 75. Southwest wind 9 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Mostly clear, with a low around 46. Southwest wind around 7 mph becoming north after midnight.
Sunday
Sunny, with a high near 61. North wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 36. Calm wind.
Monday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming east southeast 5 to 8 mph in the morning.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 48. Southeast wind around 8 mph. Chance of precipitation is 70%.
Tuesday
A slight chance of showers before noon. Partly sunny, with a high near 67. South wind 7 to 9 mph becoming north in the afternoon.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 40. North wind 3 to 6 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 60. Light and variable wind becoming east southeast around 6 mph in the morning.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 46. South southeast wind 3 to 7 mph.
Thursday
Showers likely. Mostly cloudy, with a high near 65. South wind 7 to 9 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 46. South southeast wind around 7 mph.
Friday
A chance of showers. Partly sunny, with a high near 62. South southeast wind 7 to 10 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Tower IL
 37.64°N 89.52°W
Last Update:
7:47 pm CST Nov 14, 2025
Forecast Valid:
9pm CST Nov 14, 2025-6pm CST Nov 21, 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