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

44°F

7°C

Humidity 100%
Wind Speed SW 5 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 44°F (7°C)
Visibility 0.25 mi
Wind Chill41°F (5°C)
Last update 23 Nov 7:52 am CST
Extended Forecast for

3 Miles SW Vergennes IL

Dense Fog Advisory November 23, 08:12am until November 23, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory November 23, 08:12am until November 23, 09:00am

    NOW until 9:00am Sun

    Dense Fog Advisory

  • Today

    High: 53 °F

    Patchy Dense
    Fog then
    Partly Sunny

  • Tonight

    Tonight: Patchy fog between 8pm and midnight. Otherwise, increasing clouds, with a low around 43. Calm wind.

    Low: 43 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Monday

    Monday: Showers likely after noon. Cloudy, with a high near 58. South southeast wind 3 to 8 mph. Chance of precipitation is 60%.

    High: 58 °F

    Mostly Cloudy
    then Showers
    Likely

  • Monday Night

    Monday Night: Showers. Low around 50. South southeast wind around 6 mph. Chance of precipitation is 100%.

    Low: 50 °F

    Showers then
    Showers
    Likely

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 64. West wind 5 to 8 mph.

    High: 64 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 38. Light west wind becoming west northwest 9 to 14 mph in the evening. Winds could gust as high as 20 mph.

    Low: 38 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 48. West northwest wind 8 to 15 mph, with gusts as high as 22 mph.

    High: 48 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. West northwest wind 3 to 6 mph.

    Low: 29 °F

    Partly Cloudy

Detailed Forecast

Today
Patchy dense fog before 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 53. Calm wind.
Tonight
Patchy fog between 8pm and midnight. Otherwise, increasing clouds, with a low around 43. Calm wind.
Monday
Showers likely after noon. Cloudy, with a high near 58. South southeast wind 3 to 8 mph. Chance of precipitation is 60%.
Monday Night
Showers. Low around 50. South southeast wind around 6 mph. Chance of precipitation is 100%.
Tuesday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 64. West wind 5 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 38. Light west wind becoming west northwest 9 to 14 mph in the evening. Winds could gust as high as 20 mph.
Wednesday
Sunny, with a high near 48. West northwest wind 8 to 15 mph, with gusts as high as 22 mph.
Wednesday Night
Partly cloudy, with a low around 29. West northwest wind 3 to 6 mph.
Thanksgiving Day
Sunny, with a high near 46. West northwest wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 26. Calm wind.
Friday
Mostly sunny, with a high near 46. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly cloudy, with a low around 33. South southeast wind 3 to 7 mph.
Saturday
A chance of showers. Mostly cloudy, with a high near 49. South southeast wind 7 to 10 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Vergennes IL
 37.86°N 89.39°W
Last Update:
7:26 am CST Nov 23, 2025
Forecast Valid:
8am CST Nov 23, 2025-6pm CST Nov 29, 2025
 
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