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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fog/Mist

73°F

23°C

Humidity 96%
Wind Speed S 5 mph
Barometer 29.93 in (1013.2 mb)
Dewpoint 72°F (22°C)
Visibility 6.00 mi
Last update 26 Jun 10:52 pm CDT
Extended Forecast for

Vergennes IL

Flood Watch June 26, 11:10pm until June 28, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 26, 11:10pm until June 28, 07:00am

    NOW until 7:00am Sun

    Flood Watch

  • Tonight

    Low: 72 °F

    Showers

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before 4pm. Mostly cloudy, with a high near 85. Southwest wind 5 to 7 mph. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Increasing clouds, with a low around 72. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 10 percent chance of showers before 7am. Sunny, with a high near 93. Heat index values as high as 108. Light south southeast wind becoming south southwest 5 to 10 mph in the morning.

    High: 93 °F

    Slight Chance
    Showers then
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South wind 3 to 8 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95. South southwest wind 3 to 8 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind 5 to 7 mph becoming calm after midnight.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Light south southwest wind.

    High: 95 °F

    Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Steady temperature around 72. South southwest wind 3 to 5 mph. Chance of precipitation is 100%.
Saturday
Showers and thunderstorms likely, mainly before 4pm. Mostly cloudy, with a high near 85. Southwest wind 5 to 7 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms. Increasing clouds, with a low around 72. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Sunday
A 10 percent chance of showers before 7am. Sunny, with a high near 93. Heat index values as high as 108. Light south southeast wind becoming south southwest 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 74. South wind 3 to 8 mph.
Monday
Sunny, with a high near 95. South southwest wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 75. South wind 5 to 7 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 95. Light south southwest wind.
Tuesday Night
Clear, with a low around 75. South wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 95. Light south southwest wind.
Wednesday Night
Mostly clear, with a low around 76. Light and variable wind.
Thursday
Sunny and hot, with a high near 97. Calm wind.
Thursday Night
Mostly clear, with a low around 76. Calm wind.
Friday
A chance of showers and thunderstorms. Sunny, with a high near 96. Calm wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Vergennes IL
 37.9°N 89.33°W
Last Update:
10:21 pm CDT Jun 26, 2026
Forecast Valid:
11pm CDT Jun 26, 2026-6pm CDT Jul 3, 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