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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Vergennes IL

  • Overnight

    Overnight: Clear, with a low around 48. Calm wind.

    Low: 48 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. Calm wind becoming south around 5 mph in the afternoon.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 60. Calm wind.

    Low: 60 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. Light south southeast wind becoming south 5 to 10 mph in the morning.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67. South wind 5 to 7 mph.

    Low: 67 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 90. South southwest wind 8 to 14 mph, with gusts as high as 18 mph.

    High: 90 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 67. South wind 3 to 5 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers

  • Friday

    Friday: Showers likely. Mostly cloudy, with a high near 78. South wind 5 to 9 mph becoming north in the afternoon.

    High: 78 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers. Mostly cloudy, with a low around 59. North northeast wind 5 to 9 mph.

    Low: 59 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 48. Calm wind.
Tuesday
Sunny, with a high near 84. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 60. Calm wind.
Wednesday
Mostly sunny, with a high near 88. Light south southeast wind becoming south 5 to 10 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 67. South wind 5 to 7 mph.
Thursday
Partly sunny, with a high near 90. South southwest wind 8 to 14 mph, with gusts as high as 18 mph.
Thursday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 67. South wind 3 to 5 mph. Chance of precipitation is 40%.
Friday
Showers likely. Mostly cloudy, with a high near 78. South wind 5 to 9 mph becoming north in the afternoon.
Friday Night
A chance of showers. Mostly cloudy, with a low around 59. North northeast wind 5 to 9 mph.
Saturday
A chance of showers. Mostly cloudy, with a high near 72. Northeast wind 6 to 8 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 59. Northeast wind around 5 mph becoming calm.
Sunday
A slight chance of showers. Partly sunny, with a high near 72. North wind 6 to 10 mph.
Sunday Night
Partly cloudy, with a low around 52. North wind 5 to 7 mph.
Monday
Sunny, with a high near 71. Northeast wind 5 to 9 mph.
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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:
1:25 am CDT Sep 29, 2026
Forecast Valid:
2am CDT Sep 29, 2026-6pm CDT Oct 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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