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

74°F

23°C

Humidity 43%
Wind Speed S 18 G 23 mph
Barometer 30.25 in (1024.6 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 9 Apr 12:56 pm CDT
Extended Forecast for

9 Miles WSW Johnsonville IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 55. South wind 7 to 9 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 73. South southwest wind 9 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 50%.

    High: 73 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. Northeast wind around 6 mph. Chance of precipitation is 30%.

    Low: 49 °F

    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 74. East northeast wind around 6 mph becoming southeast in the afternoon. Chance of precipitation is 20%.

    High: 74 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 58. East southeast wind 3 to 6 mph.

    Low: 58 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 80. South southwest wind 7 to 17 mph, with gusts as high as 25 mph.

    High: 80 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. South southwest wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 64 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 81. South southwest wind 13 to 16 mph, with gusts as high as 24 mph.

    High: 81 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 78. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 55. South wind 7 to 9 mph, with gusts as high as 18 mph.
Friday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 73. South southwest wind 9 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. Northeast wind around 6 mph. Chance of precipitation is 30%.
Saturday
A slight chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 74. East northeast wind around 6 mph becoming southeast in the afternoon. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 58. East southeast wind 3 to 6 mph.
Sunday
Partly sunny, with a high near 80. South southwest wind 7 to 17 mph, with gusts as high as 25 mph.
Sunday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. South southwest wind 11 to 13 mph, with gusts as high as 23 mph.
Monday
A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 81. South southwest wind 13 to 16 mph, with gusts as high as 24 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. South southwest wind around 11 mph, with gusts as high as 22 mph.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 10 to 17 mph, with gusts as high as 24 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southwest wind around 11 mph, with gusts as high as 23 mph.
Wednesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South southwest wind 13 to 16 mph, with gusts as high as 24 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WSW Johnsonville IL
 38.48°N 88.68°W
Last Update:
1:27 pm CDT Apr 9, 2026
Forecast Valid:
1pm CDT Apr 9, 2026-6pm CDT Apr 15, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation