Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33° N Lon: 88.85° W Elev: 466 ft.

Fair

73°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 30.00 in (1015.7 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 2 Sep 11:56 pm CDT
Detailed forecast for

Jefferson County

Tonight
Clear. Lows in the mid 70s. South winds around 5 mph.
Thursday
Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph.
Thursday Night
Clear. Lows in the upper 70s. South winds around 5 mph in the evening, becoming light and variable.
Friday
Sunny, hot with highs around 100. Southwest winds around 5 mph.
Friday Night
Mostly clear. Lows in the mid 70s. Calm winds.
Saturday And Saturday Night
Partly cloudy. Hot. Highs in the upper 90s. Lows in the lower 70s.
Sunday Through Monday Night
Mostly clear. Highs in the mid 90s. Lows around 70.
Tuesday
Mostly sunny. Hot with highs in the mid 90s.
Tuesday Night And Wednesday
Mostly clear. Hot. Lows in the lower 70s. Highs in the mid 90s.



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1112 PM CDT Wed Sep 2 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database