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.

Partly Cloudy

85°F

29°C

Humidity 77%
Wind Speed S 9 mph
Barometer 30.02 in (1016.2 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 29 Jun 9:52 am CDT
Extended Forecast for

5 Miles NNW Vergennes IL

Extreme Heat Warning June 29, 11:00am until July 3, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

    Today: Sunny, with a high near 95. Heat index values as high as 112. South wind 6 to 13 mph, with gusts as high as 18 mph.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. South wind 5 to 9 mph becoming light south southwest after midnight.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. Heat index values as high as 112. South southwest wind 3 to 8 mph.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 73. South wind 5 to 7 mph becoming calm in the evening.

    Low: 73 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 98. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 98 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 76. South wind around 6 mph becoming calm in the evening.

    Low: 76 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 98. Calm wind becoming south around 5 mph in the afternoon.

    High: 98 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 76. Light and variable wind.

    Low: 76 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Light and variable wind.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 112. South wind 6 to 13 mph, with gusts as high as 18 mph.
Tonight
Mostly clear, with a low around 75. South wind 5 to 9 mph becoming light south southwest after midnight.
Tuesday
Sunny, with a high near 96. Heat index values as high as 112. South southwest wind 3 to 8 mph.
Tuesday Night
Clear, with a low around 73. South wind 5 to 7 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 98. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Wednesday Night
Clear, with a low around 76. South wind around 6 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 98. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 76. Light and variable wind.
Friday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Light and variable wind.
Friday Night
Partly cloudy, with a low around 76. Calm wind.
Independence Day
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 95. Calm wind.
Saturday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 75. Calm wind.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 93. Light and variable wind.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNW Vergennes IL
 37.97°N 89.39°W
Last Update:
9:06 am CDT Jun 29, 2026
Forecast Valid:
10am CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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