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

45°F

7°C

Humidity 93%
Wind Speed Calm
Barometer 30.10 in (1019.6 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 14 May 4:56 am CDT
Extended Forecast for

Mount Vernon IL

  • Today

    Today: Sunny, with a high near 74. Calm wind.

    High: 74 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 53. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 53 °F

    Mostly Clear

  • Friday

    Friday: A chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and noon. Partly sunny, with a high near 81. Southeast wind 8 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers then
    Mostly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 66. South wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 85 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66. South wind 5 to 9 mph, with gusts as high as 18 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 89. South wind 6 to 14 mph, with gusts as high as 21 mph.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 69. South wind 8 to 11 mph, with gusts as high as 22 mph.

    Low: 69 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 88 °F

    Sunny then
    Slight Chance
    T-storms and
    Breezy

Detailed Forecast

Today
Sunny, with a high near 74. Calm wind.
Tonight
Mostly clear, with a low around 53. Calm wind becoming south southeast around 6 mph after midnight.
Friday
A chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and noon. Partly sunny, with a high near 81. Southeast wind 8 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Friday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 66. South wind 7 to 10 mph, with gusts as high as 18 mph.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 66. South wind 5 to 9 mph, with gusts as high as 18 mph.
Sunday
Sunny, with a high near 89. South wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 69. South wind 8 to 11 mph, with gusts as high as 22 mph.
Monday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 26 mph.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 10 to 14 mph, with gusts as high as 22 mph.
Tuesday
Showers and thunderstorms likely. Partly sunny, with a high near 84. South southwest wind 11 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. South wind 5 to 9 mph, with gusts as high as 18 mph.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 81. South southwest wind 5 to 8 mph becoming northwest in the afternoon.
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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:
5:21 am CDT May 14, 2026
Forecast Valid:
5am CDT May 14, 2026-6pm CDT May 20, 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