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.

Overcast with Haze

28°F

-2°C

Humidity 75%
Wind Speed N 8 mph
Barometer 30.29 in (1026.0 mb)
Dewpoint 21°F (-6°C)
Visibility 6.00 mi
Wind Chill20°F (-7°C)
Last update 4 Feb 2:52 am CST
Extended Forecast for

Grand Tower IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 23. North wind around 7 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 33. North wind 6 to 10 mph.

    High: 33 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 15. North wind 5 to 7 mph becoming calm in the evening.

    Low: 15 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 37. Calm wind becoming south southwest 5 to 9 mph in the afternoon.

    High: 37 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 28. South wind 6 to 9 mph becoming west after midnight.

    Low: 28 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 51. West wind 6 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 51 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 25. North wind 3 to 7 mph.

    Low: 25 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 42. Light and variable wind becoming east around 6 mph in the afternoon.

    High: 42 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. South wind around 6 mph.

    Low: 29 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 23. North wind around 7 mph.
Wednesday
Partly sunny, with a high near 33. North wind 6 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 15. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Partly sunny, with a high near 37. Calm wind becoming south southwest 5 to 9 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 28. South wind 6 to 9 mph becoming west after midnight.
Friday
Sunny, with a high near 51. West wind 6 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.
Friday Night
Partly cloudy, with a low around 25. North wind 3 to 7 mph.
Saturday
Sunny, with a high near 42. Light and variable wind becoming east around 6 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 29. South wind around 6 mph.
Sunday
Mostly sunny, with a high near 53. South wind 5 to 7 mph becoming north in the afternoon.
Sunday Night
Partly cloudy, with a low around 29. Light north northeast wind.
Monday
Mostly sunny, with a high near 52. Calm wind becoming south southwest around 5 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 37. South wind around 6 mph.
Tuesday
A slight chance of showers. Partly sunny, with a high near 59. South wind 6 to 8 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:
3:16 am CST Feb 4, 2026
Forecast Valid:
3am CST Feb 4, 2026-6pm CST Feb 10, 2026
 
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Additional Resources

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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