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.

Partly Cloudy

86°F

30°C

Humidity 45%
Wind Speed Vrbl 6 mph
Barometer 30.04 in (1017.3 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 30 Jul 2:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 87. Calm wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 40%.

    High: 87 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 68. Southeast wind around 8 mph becoming south southwest after midnight. Chance of precipitation is 80%.

    Low: 68 °F

    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 1pm, then showers likely between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, with a high near 81. West wind 8 to 11 mph. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. North northwest wind 7 to 11 mph. Chance of precipitation is 40%.

    Low: 65 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. North wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    High: 81 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64. North wind 5 to 9 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 84 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 87. Calm wind.
Tonight
Partly cloudy, with a low around 65. Calm wind.
Friday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 87. Calm wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 40%.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 68. Southeast wind around 8 mph becoming south southwest after midnight. Chance of precipitation is 80%.
Saturday
A chance of showers and thunderstorms before 1pm, then showers likely between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, with a high near 81. West wind 8 to 11 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. North northwest wind 7 to 11 mph. Chance of precipitation is 40%.
Sunday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. North wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Sunday Night
Partly cloudy, with a low around 64. North wind 5 to 9 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 65. Calm wind.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 87. Calm wind.
Tuesday Night
Mostly clear, with a low around 68. Calm wind.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 90. Calm wind.
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
12:11 pm CDT Jul 30, 2026
Forecast Valid:
4pm CDT Jul 30, 2026-6pm CDT Aug 5, 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