Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
33°F
1°C
| Humidity | 100% |
| Wind Speed | Calm |
| Barometer | 30.06 in (1018.3 mb) |
| Dewpoint | 33°F (1°C) |
| Visibility | 8.00 mi |
| Last update | 16 Feb 12:52 am CST |
Extended Forecast for
3 Miles SW Vergennes IL
Dense Fog Advisory until February 16, 09:00am
NOW until 9:00am Mon
Dense Fog Advisory
Overnight
Low: 38 °F
Areas Dense
FogWashington's Birthday
High: 62 °F
Areas Dense
Fog then
Mostly SunnyMonday Night
Low: 43 °F
Partly Cloudy
Tuesday
High: 63 °F
Mostly Cloudy
then Mostly
Cloudy and
BreezyTuesday Night
Low: 57 °F
Mostly Cloudy
and BreezyWednesday
High: 72 °F
Mostly Sunny
and Breezy
then Mostly
SunnyWednesday Night
Low: 48 °F
Mostly Clear
then Slight
Chance
ShowersThursday
High: 72 °F
Chance
Showers then
Chance
T-storms
Detailed Forecast
Overnight
Areas of dense fog. Otherwise, partly cloudy, with a steady temperature around 38. Light south southwest wind.
Washington's Birthday
Areas of dense fog before 9am. Otherwise, mostly sunny, with a high near 62. Light south southwest wind increasing to 6 to 11 mph in the morning.
Monday Night
Partly cloudy, with a low around 43. South wind around 8 mph.
Tuesday
Mostly cloudy, with a high near 63. Breezy, with a south wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.
Tuesday Night
Mostly cloudy, with a low around 57. Breezy, with a south wind 21 to 26 mph, with gusts as high as 36 mph.
Wednesday
Mostly sunny, with a high near 72. Breezy, with a south southwest wind 16 to 21 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 30 mph.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly clear, with a low around 48. South southwest wind around 8 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. South wind 8 to 15 mph, with gusts as high as 24 mph.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 41. South southwest wind 11 to 13 mph becoming west after midnight. Winds could gust as high as 21 mph.
Friday
A slight chance of showers after noon. Mostly sunny, with a high near 55. West northwest wind 8 to 13 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers. Partly cloudy, with a low around 33. North northwest wind around 7 mph.
Saturday
A slight chance of showers. Mostly sunny, with a high near 51. North northwest wind 6 to 9 mph.
Saturday Night
A chance of showers. Partly cloudy, with a low around 30. Northwest wind 7 to 10 mph.
Sunday
A slight chance of showers. Mostly sunny, with a high near 45. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
3 Miles SW Vergennes IL
37.86°N 89.39°W
37.86°N 89.39°W
12:47 am CST Feb 16, 2026
1am CST Feb 16, 2026-6pm CST Feb 22, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
