Current conditions at

Mount Vernon Airport (KMVN)

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

Fair

91°F

33°C

Humidity 56%
Wind Speed SE 7 mph
Barometer 30.07 in (1018.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 17 Aug 12:56 pm CDT
Detailed forecast for

Jefferson County

This Afternoon
Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the upper 90s. East winds around 5 mph. Chance of rain 20 percent.
Tonight
Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the mid 70s. East winds around 5 mph. Chance of rain 20 percent.
Monday
Sunny, hot with highs in the upper 90s. East winds around 5 mph. Highest heat index readings heat index readings up to 105 in the afternoon.
Monday Night
Mostly clear. Lows in the mid 70s. Southeast winds around 5 mph.
Tuesday
Mostly sunny. Hot with highs in the mid 90s. Southwest winds around 5 mph, becoming west around 5 mph in the afternoon.
Tuesday Night
Partly cloudy. A chance of showers and thunderstorms in the evening. Lows in the lower 70s. Chance of rain 40 percent.
Wednesday
Partly sunny. A chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 30 percent.
Wednesday Night And Thursday
Partly cloudy. Lows in the upper 60s. Highs in the upper 80s.
Thursday Night Through Saturday
Mostly clear. Lows in the upper 60s. Highs around 90.



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1229 PM CDT Sun Aug 17 2025
 
 

Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database