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.

A Few Clouds

43°F

6°C

Humidity 68%
Wind Speed Calm
Barometer 30.16 in (1022.0 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 25 Mar 1:56 am CDT
Extended Forecast for

Mount Vernon IL

  • Overnight

    Overnight: Partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74. Light and variable wind becoming south southwest 8 to 13 mph in the morning.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms between 1am and 2am. Partly cloudy, with a low around 61. South wind 8 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Sunny, with a high near 85. South southwest wind 11 to 16 mph, with gusts as high as 25 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 44. South southwest wind 11 to 15 mph becoming north northeast after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    Low: 44 °F

    Chance
    Showers then
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm. Partly sunny, with a high near 52. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 52 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 32. North wind 5 to 10 mph becoming light after midnight.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 57. Calm wind becoming east around 6 mph in the morning.

    High: 57 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 39. Southeast wind 3 to 5 mph.

    Low: 39 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 42. Calm wind.
Wednesday
Mostly sunny, with a high near 74. Light and variable wind becoming south southwest 8 to 13 mph in the morning.
Wednesday Night
A slight chance of showers and thunderstorms between 1am and 2am. Partly cloudy, with a low around 61. South wind 8 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 85. South southwest wind 11 to 16 mph, with gusts as high as 25 mph.
Thursday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 44. South southwest wind 11 to 15 mph becoming north northeast after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Friday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm. Partly sunny, with a high near 52. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Friday Night
Mostly clear, with a low around 32. North wind 5 to 10 mph becoming light after midnight.
Saturday
Sunny, with a high near 57. Calm wind becoming east around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 39. Southeast wind 3 to 5 mph.
Sunday
Partly sunny, with a high near 64. South wind 5 to 9 mph.
Sunday Night
Mostly cloudy, with a low around 53. South wind 7 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 78. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 60. South southwest wind around 11 mph, with gusts as high as 21 mph.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 78. South southwest wind 10 to 15 mph, with gusts as high as 22 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:
1:26 am CDT Mar 25, 2026
Forecast Valid:
2am CDT Mar 25, 2026-6pm CDT Mar 31, 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