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

39°F

4°C

Humidity 96%
Wind Speed SE 7 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 38°F (3°C)
Visibility 5.00 mi
Wind Chill34°F (1°C)
Last update 17 Feb 5:52 am CST
Extended Forecast for

3 Miles SW Vergennes IL

  • Today

    Today: Patchy fog between 7am and 9am. Otherwise, mostly cloudy, with a high near 64. South wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 64 °F

    Patchy Fog
    then Cloudy

  • Tonight

    Tonight: A 20 percent chance of rain after 5am. Mostly cloudy, with a low around 55. Breezy, with a south wind 17 to 23 mph, with gusts as high as 34 mph.

    Low: 55 °F

    Breezy.
    Cloudy then
    Slight Chance
    Rain

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. Southwest wind 8 to 18 mph, with gusts as high as 28 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after midnight. Partly cloudy, with a low around 54. South wind around 8 mph.

    Low: 54 °F

    Mostly Clear
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South southwest wind 9 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.

    High: 71 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 39. South southwest wind 10 to 14 mph becoming west after midnight. Winds could gust as high as 21 mph.

    Low: 39 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 54. West northwest wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 54 °F

    Sunny

  • Friday Night

    Friday Night: A slight chance of showers after midnight. Partly cloudy, with a low around 32. North northwest wind around 6 mph.

    Low: 32 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A slight chance of rain and snow showers before noon, then a chance of rain showers. Mostly sunny, with a high near 47. North northwest wind 6 to 10 mph.

    High: 47 °F

    Slight Chance
    Rain/Snow
    then Chance
    Showers

Detailed Forecast

Today
Patchy fog between 7am and 9am. Otherwise, mostly cloudy, with a high near 64. South wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph.
Tonight
A 20 percent chance of rain after 5am. Mostly cloudy, with a low around 55. Breezy, with a south wind 17 to 23 mph, with gusts as high as 34 mph.
Wednesday
Mostly sunny, with a high near 73. Southwest wind 8 to 18 mph, with gusts as high as 28 mph.
Wednesday Night
A 30 percent chance of showers after midnight. Partly cloudy, with a low around 54. South wind around 8 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South southwest wind 9 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
Thursday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 39. South southwest wind 10 to 14 mph becoming west after midnight. Winds could gust as high as 21 mph.
Friday
Sunny, with a high near 54. West northwest wind 7 to 13 mph, with gusts as high as 20 mph.
Friday Night
A slight chance of showers after midnight. Partly cloudy, with a low around 32. North northwest wind around 6 mph.
Saturday
A slight chance of rain and snow showers before noon, then a chance of rain showers. Mostly sunny, with a high near 47. North northwest wind 6 to 10 mph.
Saturday Night
A slight chance of rain and snow showers. Mostly clear, with a low around 27. Northwest wind 9 to 11 mph.
Sunday
Sunny, with a high near 41. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 20. North northwest wind 7 to 9 mph.
Monday
Sunny, with a high near 40. North northwest wind 5 to 8 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:
5:32 am CST Feb 17, 2026
Forecast Valid:
6am CST Feb 17, 2026-6pm CST Feb 23, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation