National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Partly Cloudy

65°F

18°C

Humidity 93%
Wind Speed S 12 mph
Barometer 29.91 in (1012.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 10 Mar 3:52 am CDT
Extended Forecast for

Grand Tower IL

  • Today

    Today: Mostly cloudy, with a high near 79. South southwest wind 7 to 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Mostly Cloudy

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 65. South southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 4pm, then showers likely. Temperature rising to near 71 by 11am, then falling to around 56 during the remainder of the day. South southwest wind 14 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 90%.

    High: 71 °F⇓

    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 35. Breezy, with a north northwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 29 mph.

    Low: 35 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Thursday

    Thursday: Sunny, with a high near 56. North wind around 6 mph becoming west southwest in the afternoon.

    High: 56 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 42. South wind 7 to 12 mph increasing to 13 to 18 mph after midnight. Winds could gust as high as 28 mph.

    Low: 42 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 66. South southwest wind 9 to 16 mph, with gusts as high as 26 mph.

    High: 66 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 42. West northwest wind around 6 mph becoming east after midnight.

    Low: 42 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 70. South wind 7 to 14 mph, with gusts as high as 22 mph.

    High: 70 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 79. South southwest wind 7 to 15 mph, with gusts as high as 25 mph.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 65. South southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm before 4pm, then showers likely. Temperature rising to near 71 by 11am, then falling to around 56 during the remainder of the day. South southwest wind 14 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 90%.
Wednesday Night
Mostly cloudy, with a low around 35. Breezy, with a north northwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 29 mph.
Thursday
Sunny, with a high near 56. North wind around 6 mph becoming west southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 42. South wind 7 to 12 mph increasing to 13 to 18 mph after midnight. Winds could gust as high as 28 mph.
Friday
Partly sunny, with a high near 66. South southwest wind 9 to 16 mph, with gusts as high as 26 mph.
Friday Night
Partly cloudy, with a low around 42. West northwest wind around 6 mph becoming east after midnight.
Saturday
Sunny, with a high near 70. South wind 7 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 55. South wind 13 to 15 mph, with gusts as high as 25 mph.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 67. Breezy, with a south southwest wind 16 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph.
Sunday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 26. Blustery, with a northwest wind 16 to 21 mph, with gusts as high as 29 mph.
Monday
A slight chance of snow showers. Mostly sunny, with a high near 40. Northwest wind 11 to 14 mph, with gusts as high as 22 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:
4:36 am CDT Mar 10, 2026
Forecast Valid:
4am CDT Mar 10, 2026-6pm CDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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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