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.

Mostly Cloudy

47°F

8°C

Humidity 61%
Wind Speed NE 7 mph
Barometer 30.27 in (1025.5 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 20 Apr 1:56 am CDT
Extended Forecast for

9 Miles WSW Johnsonville IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 39. Light northeast wind.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 65. Calm wind becoming east around 5 mph.

    High: 65 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. Calm wind becoming south southeast around 6 mph in the evening.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76. Southwest wind 6 to 16 mph, with gusts as high as 23 mph.

    High: 76 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54. Southwest wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77. Southwest wind 6 to 9 mph.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. South wind around 6 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80. South wind 6 to 14 mph, with gusts as high as 23 mph.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. South wind around 10 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Overnight
Mostly cloudy, with a low around 39. Light northeast wind.
Monday
Sunny, with a high near 65. Calm wind becoming east around 5 mph.
Monday Night
Mostly clear, with a low around 47. Calm wind becoming south southeast around 6 mph in the evening.
Tuesday
Mostly sunny, with a high near 76. Southwest wind 6 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 54. Southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 77. Southwest wind 6 to 9 mph.
Wednesday Night
Mostly clear, with a low around 56. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 80. South wind 6 to 14 mph, with gusts as high as 23 mph.
Thursday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. South wind around 10 mph, with gusts as high as 21 mph.
Friday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 74. South wind 10 to 13 mph, with gusts as high as 21 mph.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. West southwest wind around 7 mph becoming north northwest after midnight.
Saturday
A chance of showers. Mostly sunny, with a high near 73. North wind 7 to 9 mph.
Saturday Night
A chance of showers. Partly cloudy, with a low around 51. Northeast wind around 6 mph.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 73. North northeast wind around 8 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:
1:26 am CDT Apr 20, 2026
Forecast Valid:
2am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
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Additional Resources

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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