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

87°F

31°C

Humidity 46%
Wind Speed NE 8 mph
Barometer 29.95 in (1014.1 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 3 Aug 4:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • Tonight

    Tonight: Mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Clear

  • Tuesday

    Tuesday: Patchy fog before 7am. Otherwise, sunny, with a high near 87. Calm wind.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear
    then Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 86. Calm wind becoming south southwest around 5 mph.

    High: 86 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 60%.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms. Partly sunny, with a high near 86. Calm wind.

    High: 86 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 63. Calm wind.
Tuesday
Patchy fog before 7am. Otherwise, sunny, with a high near 87. Calm wind.
Tuesday Night
Mostly clear, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 88. Calm wind.
Wednesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Calm wind.
Thursday
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 86. Calm wind becoming south southwest around 5 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Calm wind.
Friday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 68. Calm wind.
Saturday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind.
Saturday Night
Mostly clear, with a low around 69. Calm wind.
Sunday
Mostly sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 71. Light south southwest wind.
Monday
Mostly sunny, with a high near 91. Southwest wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.33°N 88.91°W
Last Update:
5:01 pm CDT Aug 3, 2026
Forecast Valid:
5pm CDT Aug 3, 2026-6pm CDT Aug 10, 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