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

47°F

8°C

Humidity 44%
Wind Speed E 5 mph
Barometer 30.40 in
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 28 Mar 8:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • Tonight

    Tonight: Increasing clouds, with a low around 39. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 39 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 68. South southwest wind 6 to 15 mph, with gusts as high as 26 mph.

    High: 68 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 55. South wind 9 to 11 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 78. South southwest wind 11 to 17 mph, with gusts as high as 28 mph.

    High: 78 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. South southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 29 mph.

    High: 82 °F

    Breezy.
    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 48. South southwest wind 11 to 16 mph becoming north after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%.

    Low: 48 °F

    Chance
    T-storms then
    Showers

  • Wednesday

    Wednesday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 57. Northeast wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 57 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 44. Northeast wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 44 °F

    Showers
    Likely

Detailed Forecast

Tonight
Increasing clouds, with a low around 39. Calm wind becoming south southeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 68. South southwest wind 6 to 15 mph, with gusts as high as 26 mph.
Sunday Night
Partly cloudy, with a low around 55. South wind 9 to 11 mph, with gusts as high as 24 mph.
Monday
Mostly sunny, with a high near 78. South southwest wind 11 to 17 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 65. South southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 29 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 48. South southwest wind 11 to 16 mph becoming north after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%.
Wednesday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 57. Northeast wind 11 to 13 mph, with gusts as high as 21 mph.
Wednesday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 44. Northeast wind 11 to 13 mph, with gusts as high as 21 mph.
Thursday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 62. East wind 11 to 14 mph, with gusts as high as 22 mph.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 47. East northeast wind 6 to 9 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 71. East northeast wind 7 to 9 mph becoming south southeast in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. South southeast wind 7 to 10 mph, with gusts as high as 20 mph.
Saturday
Showers likely. Mostly cloudy, with a high near 70. Southwest wind 13 to 16 mph, with gusts as high as 23 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
9:02 pm CDT Mar 28, 2026
Forecast Valid:
9pm CDT Mar 28, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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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