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

63°F

17°C

Humidity 78%
Wind Speed SW 9 mph
Barometer 29.87 in (1011.0 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 3:52 am CST
Extended Forecast for

4 Miles SW Vergennes IL

  • Today

    Today: Mostly sunny, with a high near 76. Southwest wind 10 to 16 mph, with gusts as high as 23 mph.

    High: 76 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 45. West wind around 8 mph becoming north northwest after midnight.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 60. North wind 3 to 8 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming southeast 5 to 9 mph in the morning.

    High: 60 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers likely before 9pm, then showers likely and possibly a thunderstorm between 9pm and 3am, then showers likely after 3am. Mostly cloudy, with a low around 47. Southeast wind 8 to 10 mph. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Partly sunny, with a high near 72. South wind 8 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 72 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Partly cloudy, with a low around 46. North wind 5 to 7 mph.

    Low: 46 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Partly sunny, with a high near 64. Northeast wind 5 to 7 mph becoming southeast in the afternoon.

    High: 64 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 76. Southwest wind 10 to 16 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 45. West wind around 8 mph becoming north northwest after midnight.
Sunday
Sunny, with a high near 60. North wind 3 to 8 mph.
Sunday Night
Mostly clear, with a low around 36. Calm wind.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming southeast 5 to 9 mph in the morning.
Monday Night
Showers likely before 9pm, then showers likely and possibly a thunderstorm between 9pm and 3am, then showers likely after 3am. Mostly cloudy, with a low around 47. Southeast wind 8 to 10 mph. Chance of precipitation is 70%.
Tuesday
A 20 percent chance of showers before noon. Partly sunny, with a high near 72. South wind 8 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 46. North wind 5 to 7 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 64. Northeast wind 5 to 7 mph becoming southeast in the afternoon.
Wednesday Night
Showers likely, mainly after midnight. Mostly cloudy, with a low around 52. Southeast wind 5 to 7 mph.
Thursday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 66. South southeast wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 54. South southeast wind around 10 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 66. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Vergennes IL
 37.86°N 89.39°W
Last Update:
3:16 am CST Nov 15, 2025
Forecast Valid:
4am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
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Additional Resources

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Chance of Precipitation