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

77°F

25°C

Humidity 35%
Wind Speed SW 13 mph
Barometer 30.18 in (1022.2 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 9 Apr 4:56 pm CDT
Extended Forecast for

9 Miles WSW Johnsonville IL

  • 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. Chance of precipitation is 60%.

    Low: 64 °F

    Slight Chance
    Showers then
    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

  • Monday Night

    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.

    Low: 67 °F

    Slight Chance
    T-storms

Detailed Forecast

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. Chance of precipitation is 60%.
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, mainly after 1pm. 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.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Southwest wind 7 to 9 mph.
Thursday
A chance of showers. Partly sunny, with a high near 78. Southwest wind 7 to 9 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:
5:26 pm CDT Apr 9, 2026
Forecast Valid:
5pm CDT Apr 9, 2026-6pm CDT Apr 16, 2026
 
Forecast Discussion
 
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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