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.

Partly Cloudy and Breezy

56°F

13°C

Humidity 77%
Wind Speed S 21 G 38 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 17 Feb 6:52 pm CST
Extended Forecast for

3 Miles SW Vergennes IL

  • Tonight

    Tonight: A slight chance of showers between 1am and 4am. Cloudy, with a temperature rising to around 59 by 5am. Breezy, with a south wind 17 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.

    Low: 55 °F⇑

    Breezy.
    Cloudy then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 73. Southwest wind 8 to 16 mph, with gusts as high as 29 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after midnight. Partly cloudy, with a low around 55. South wind around 8 mph.

    Low: 55 °F

    Mostly Clear
    then Chance
    Showers

  • Thursday

    Thursday: Showers likely, mainly after noon. Partly sunny, with a high near 70. South wind 9 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 70 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 41. West wind 11 to 14 mph, with gusts as high as 21 mph.

    Low: 41 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 54. West wind 6 to 14 mph, with gusts as high as 20 mph.

    High: 54 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 34. North northwest wind around 6 mph.

    Low: 34 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers, mainly after noon. Mostly sunny, with a high near 47. North northeast wind 6 to 10 mph.

    High: 47 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of rain and snow showers before midnight, then a slight chance of snow showers. Partly cloudy, with a low around 28. North northwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 28 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow
    Showers

Detailed Forecast

Tonight
A slight chance of showers between 1am and 4am. Cloudy, with a temperature rising to around 59 by 5am. Breezy, with a south wind 17 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 73. Southwest wind 8 to 16 mph, with gusts as high as 29 mph.
Wednesday Night
A 30 percent chance of showers after midnight. Partly cloudy, with a low around 55. South wind around 8 mph.
Thursday
Showers likely, mainly after noon. Partly sunny, with a high near 70. South wind 9 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Thursday Night
Mostly clear, with a low around 41. West wind 11 to 14 mph, with gusts as high as 21 mph.
Friday
Sunny, with a high near 54. West wind 6 to 14 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 34. North northwest wind around 6 mph.
Saturday
A chance of showers, mainly after noon. Mostly sunny, with a high near 47. North northeast wind 6 to 10 mph.
Saturday Night
A chance of rain and snow showers before midnight, then a slight chance of snow showers. Partly cloudy, with a low around 28. North northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday
A slight chance of rain and snow showers before noon. Mostly sunny, with a high near 40. Northwest wind 13 to 16 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 21. North northwest wind 8 to 11 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 39. North northwest wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 20. Calm wind becoming south southeast around 5 mph after midnight.
Tuesday
Mostly sunny, with a high near 46. South wind 6 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:
3 Miles SW Vergennes IL
 37.86°N 89.39°W
Last Update:
5:46 pm CST Feb 17, 2026
Forecast Valid:
7pm CST Feb 17, 2026-6pm CST Feb 24, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation