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.

Fair

60°F

16°C

Humidity 50%
Wind Speed S 13 G 18 mph
Barometer 30.09 in (1019.1 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 16 Feb 12:52 pm CST
Extended Forecast for

Grand Tower IL

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 61. South wind around 9 mph.

    High: 61 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 43. South wind around 7 mph.

    Low: 43 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 60. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 32 mph.

    High: 60 °F

    Areas Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 57. Breezy, with a south wind 18 to 22 mph, with gusts as high as 33 mph.

    Low: 57 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. Southwest wind 9 to 18 mph, with gusts as high as 28 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Mostly clear, with a low around 49. South wind 6 to 8 mph.

    Low: 49 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 72. South wind 6 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    High: 72 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 42. South southwest wind 8 to 11 mph becoming west after midnight. Winds could gust as high as 18 mph.

    Low: 42 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A slight chance of showers after noon. Mostly sunny, with a high near 57. West northwest wind 7 to 10 mph.

    High: 57 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

Detailed Forecast

Washington's Birthday
Mostly sunny, with a high near 61. South wind around 9 mph.
Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 43. South wind around 7 mph.
Tuesday
Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 60. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 32 mph.
Tuesday Night
Mostly cloudy, with a low around 57. Breezy, with a south wind 18 to 22 mph, with gusts as high as 33 mph.
Wednesday
Mostly sunny, with a high near 73. Southwest wind 9 to 18 mph, with gusts as high as 28 mph.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly clear, with a low around 49. South wind 6 to 8 mph.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 72. South wind 6 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 42. South southwest wind 8 to 11 mph becoming west after midnight. Winds could gust as high as 18 mph.
Friday
A slight chance of showers after noon. Mostly sunny, with a high near 57. West northwest wind 7 to 10 mph.
Friday Night
A chance of showers, mainly after midnight. Partly cloudy, with a low around 34. North wind around 6 mph.
Saturday
A slight chance of showers. Mostly sunny, with a high near 52. North wind 6 to 8 mph.
Saturday Night
A chance of showers. Partly cloudy, with a low around 31. Northwest wind around 8 mph.
Sunday
A slight chance of showers. Mostly sunny, with a high near 45. Northwest wind 8 to 11 mph, with gusts as high as 20 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:
10:47 am CST Feb 16, 2026
Forecast Valid:
1pm CST Feb 16, 2026-6pm CST Feb 22, 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