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

43°F

6°C

Humidity 49%
Wind Speed Calm
Barometer 30.38 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 28 Mar 11:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 42. South southeast wind 3 to 5 mph.

    Low: 42 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 68. South southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 68 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 56. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 56 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 79. Breezy, with a south southwest wind 11 to 21 mph, with gusts as high as 36 mph.

    High: 79 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. South southwest wind around 15 mph, with gusts as high as 26 mph.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Mostly sunny, with a high near 82. Breezy, with a south southwest wind 15 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.

    High: 82 °F

    Breezy.
    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 53. South southwest wind 10 to 17 mph becoming west northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.

    Low: 53 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Mostly cloudy, with a high near 64. North northeast wind around 11 mph, with gusts as high as 20 mph.

    High: 64 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 50. Northeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 50 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 42. South southeast wind 3 to 5 mph.
Sunday
Mostly sunny, with a high near 68. South southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 56. South wind 8 to 10 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 79. Breezy, with a south southwest wind 11 to 21 mph, with gusts as high as 36 mph.
Monday Night
Partly cloudy, with a low around 64. South southwest wind around 15 mph, with gusts as high as 26 mph.
Tuesday
A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Mostly sunny, with a high near 82. Breezy, with a south southwest wind 15 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.
Tuesday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 53. South southwest wind 10 to 17 mph becoming west northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.
Wednesday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 64. North northeast wind around 11 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 50. Northeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 67. Southeast wind around 11 mph, with gusts as high as 18 mph.
Thursday Night
Showers likely. Cloudy, with a low around 50. East wind around 8 mph becoming west after midnight.
Friday
A chance of showers. Mostly cloudy, with a high near 75. West southwest wind 7 to 9 mph becoming south in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. South wind 7 to 9 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. South wind 10 to 14 mph, with gusts as high as 21 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
12:12 am CDT Mar 29, 2026
Forecast Valid:
12am CDT Mar 29, 2026-6pm CDT Apr 4, 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