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.

Fair

51°F

11°C

Humidity 43%
Wind Speed N 10 G 17 mph
Barometer 30.38 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 23 Mar 3:56 pm CDT
Extended Forecast for

9 Miles WSW Johnsonville IL

  • This Afternoon

    This Afternoon: Partly sunny, with a steady temperature around 49. North wind around 9 mph.

    High: 49 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. East northeast wind around 6 mph.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60. East southeast wind around 6 mph.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 42. East southeast wind 3 to 5 mph.

    Low: 42 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72. Light south southeast wind becoming south southwest 5 to 10 mph in the morning.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 59. South wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 83. South southwest wind 10 to 15 mph, with gusts as high as 23 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 42. South southwest wind 15 to 17 mph becoming north northeast after midnight. Winds could gust as high as 26 mph.

    Low: 42 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers, mainly before 1pm. Mostly cloudy, with a high near 51. North wind 15 to 17 mph, with gusts as high as 25 mph.

    High: 51 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Partly sunny, with a steady temperature around 49. North wind around 9 mph.
Tonight
Mostly cloudy, with a low around 35. East northeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 60. East southeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 42. East southeast wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 72. Light south southeast wind becoming south southwest 5 to 10 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 59. South wind 6 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 83. South southwest wind 10 to 15 mph, with gusts as high as 23 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 42. South southwest wind 15 to 17 mph becoming north northeast after midnight. Winds could gust as high as 26 mph.
Friday
A chance of showers, mainly before 1pm. Mostly cloudy, with a high near 51. North wind 15 to 17 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 31. North wind 8 to 11 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 55. Northeast wind 5 to 7 mph.
Saturday Night
Partly cloudy, with a low around 35. Light southeast wind.
Sunday
Mostly sunny, with a high near 62. South southeast wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WSW Johnsonville IL
 38.48°N 88.68°W
Last Update:
4:11 pm CDT Mar 23, 2026
Forecast Valid:
4pm CDT Mar 23, 2026-6pm CDT Mar 29, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation