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.

Fair

70°F

21°C

Humidity 34%
Wind Speed SE 6 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 14 May 6:52 pm CDT
Extended Forecast for

Vergennes IL

  • Tonight

    Tonight: Increasing clouds, with a low around 52. South southeast wind 3 to 7 mph.

    Low: 52 °F

    Increasing
    Clouds

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 82. South southeast wind 9 to 16 mph becoming east in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of thunderstorms before 7pm, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. South wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. South southwest wind 11 to 14 mph, with gusts as high as 21 mph.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66. South wind 7 to 10 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 89. South wind 8 to 17 mph, with gusts as high as 24 mph.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 69. South wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 69 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Breezy, with a south wind 13 to 20 mph, with gusts as high as 26 mph.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms and
    Breezy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind around 15 mph, with gusts as high as 24 mph.

    Low: 72 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 52. South southeast wind 3 to 7 mph.
Friday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 82. South southeast wind 9 to 16 mph becoming east in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 30%.
Friday Night
A slight chance of thunderstorms before 7pm, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. South wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. South southwest wind 11 to 14 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 66. South wind 7 to 10 mph.
Sunday
Sunny, with a high near 89. South wind 8 to 17 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 69. South wind 10 to 14 mph, with gusts as high as 22 mph.
Monday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Breezy, with a south wind 13 to 20 mph, with gusts as high as 26 mph.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind around 15 mph, with gusts as high as 24 mph.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. Southwest wind 15 to 18 mph, with gusts as high as 24 mph.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. South southwest wind 5 to 11 mph, with gusts as high as 18 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. South wind 6 to 8 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Northeast wind around 6 mph becoming calm in the evening.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. Northeast wind 6 to 8 mph becoming southwest in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Vergennes IL
 37.9°N 89.33°W
Last Update:
7:16 pm CDT May 14, 2026
Forecast Valid:
7pm CDT May 14, 2026-6pm CDT May 21, 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