National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Overcast

38°F

3°C

Humidity 52%
Wind Speed Vrbl 6 mph
Barometer 30.21 in (1023.9 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 21 Feb 2:56 pm CST
Extended Forecast for

9 Miles WSW Johnsonville IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 40. Northwest wind around 7 mph.

    High: 40 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 23. Northwest wind 6 to 13 mph, with gusts as high as 23 mph.

    Low: 23 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 31. Northwest wind 14 to 18 mph, with gusts as high as 28 mph.

    High: 31 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17. Northwest wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 17 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 33. Northwest wind 7 to 14 mph, with gusts as high as 22 mph.

    High: 33 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18. Northwest wind around 5 mph becoming calm in the evening.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 48. South southwest wind 5 to 15 mph, with gusts as high as 24 mph.

    High: 48 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. Southwest wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 56. West southwest wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 56 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 40. Northwest wind around 7 mph.
Tonight
Mostly clear, with a low around 23. Northwest wind 6 to 13 mph, with gusts as high as 23 mph.
Sunday
Mostly sunny, with a high near 31. Northwest wind 14 to 18 mph, with gusts as high as 28 mph.
Sunday Night
Partly cloudy, with a low around 17. Northwest wind 11 to 13 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 33. Northwest wind 7 to 14 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 18. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 48. South southwest wind 5 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly cloudy, with a low around 40. Southwest wind 8 to 13 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy, with a high near 56. West southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 36. Southwest wind around 8 mph becoming north after midnight.
Thursday
A chance of showers. Partly sunny, with a high near 49. Northwest wind 7 to 10 mph.
Thursday Night
Mostly clear, with a low around 28. Northwest wind around 6 mph becoming south southwest after midnight.
Friday
Sunny, with a high near 55. South southwest wind 6 to 10 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WSW Johnsonville IL
 38.48°N 88.68°W
Last Update:
1:42 pm CST Feb 21, 2026
Forecast Valid:
3pm CST Feb 21, 2026-6pm CST Feb 27, 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