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/Mist

37°F

3°C

Humidity 89%
Wind Speed S 13 mph
Barometer 29.97 in (1015.0 mb)
Dewpoint 34°F (1°C)
Visibility 4.00 mi
Wind Chill29°F (-2°C)
Last update 6 Dec 8:52 pm CST
Extended Forecast for

Grand Tower IL

  • Tonight

    Tonight: A slight chance of drizzle after 4am. Patchy fog before 10pm, then patchy fog after 3am. Otherwise, cloudy, with a steady temperature around 37. South wind 3 to 5 mph.

    Low: 37 °F

    Patchy Fog
    then Slight
    Chance
    Drizzle and
    Patchy Fog

  • Sunday

    Sunday: A slight chance of drizzle. Patchy fog between 7am and 8am. Otherwise, mostly cloudy, with a high near 45. Light and variable wind becoming north northwest 5 to 10 mph in the morning.

    High: 45 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 24. North wind 7 to 11 mph, with gusts as high as 18 mph.

    Low: 24 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 37 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 25. Calm wind becoming south southwest 5 to 9 mph after midnight.

    Low: 25 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 52. Southwest wind 7 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 52 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain showers before midnight, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 29. Northwest wind around 6 mph becoming east after midnight.

    Low: 29 °F

    Slight Chance
    Showers then
    Slight Chance
    Rain/Snow

Detailed Forecast

Tonight
A slight chance of drizzle after 4am. Patchy fog before 10pm, then patchy fog after 3am. Otherwise, cloudy, with a steady temperature around 37. South wind 3 to 5 mph.
Sunday
A slight chance of drizzle. Patchy fog between 7am and 8am. Otherwise, mostly cloudy, with a high near 45. Light and variable wind becoming north northwest 5 to 10 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 24. North wind 7 to 11 mph, with gusts as high as 18 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 25. Calm wind becoming south southwest 5 to 9 mph after midnight.
Tuesday
Mostly sunny, with a high near 49. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.
Wednesday
Partly sunny, with a high near 52. Southwest wind 7 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
A slight chance of rain showers before midnight, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 29. Northwest wind around 6 mph becoming east after midnight.
Thursday
A slight chance of rain and snow showers before noon. Mostly cloudy, with a high near 41. East wind 6 to 9 mph becoming west in the afternoon.
Thursday Night
Mostly cloudy, with a low around 22. Northwest wind around 8 mph.
Friday
Partly sunny, with a high near 31. North northwest wind 8 to 10 mph.
Friday Night
Partly cloudy, with a low around 11. North northwest wind around 8 mph.
Saturday
Mostly sunny, with a high near 29. Northwest 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:
5:11 pm CST Dec 6, 2025
Forecast Valid:
9pm CST Dec 6, 2025-6pm CST Dec 13, 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