National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fog/Mist

70°F

21°C

Humidity 97%
Wind Speed Calm
Barometer 30.11 in (1019.4 mb)
Dewpoint 69°F (21°C)
Visibility 5.00 mi
Last update 5 Aug 3:52 am CDT
Extended Forecast for

Vergennes IL

  • Today

    Today: Areas of fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Areas Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog before 2am, then patchy fog after 3am. Otherwise, mostly clear, with a low around 67. Light east southeast wind.

    Low: 67 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, sunny, with a high near 89. Calm wind.

    High: 89 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Light south southeast wind.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 70. Light southeast wind.

    Low: 70 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 92. Calm wind becoming south southeast 5 to 7 mph in the morning.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 70. South southeast wind 3 to 6 mph.

    Low: 70 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 92. South wind 3 to 7 mph.

    High: 92 °F

    Sunny

Detailed Forecast

Today
Areas of fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 86. Light and variable wind.
Tonight
Patchy fog before 2am, then patchy fog after 3am. Otherwise, mostly clear, with a low around 67. Light east southeast wind.
Wednesday
Patchy fog before 8am. Otherwise, sunny, with a high near 89. Calm wind.
Wednesday Night
Mostly clear, with a low around 68. Calm wind.
Thursday
Sunny, with a high near 91. Light south southeast wind.
Thursday Night
Clear, with a low around 70. Light southeast wind.
Friday
Sunny, with a high near 92. Calm wind becoming south southeast 5 to 7 mph in the morning.
Friday Night
Clear, with a low around 70. South southeast wind 3 to 6 mph.
Saturday
Sunny, with a high near 92. South wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 71. South wind 3 to 6 mph.
Sunday
Sunny, with a high near 91. South southwest wind 3 to 7 mph.
Sunday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 72. South wind 3 to 6 mph.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. South southwest wind 3 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Vergennes IL
 37.9°N 89.33°W
Last Update:
1:31 am CDT Aug 5, 2025
Forecast Valid:
4am CDT Aug 5, 2025-6pm CDT Aug 11, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation