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

55°F

13°C

Humidity 96%
Wind Speed Calm
Barometer 30.00 in (1015.9 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 12 Oct 1:56 am CDT
Extended Forecast for

Mount Vernon IL

  • Overnight

    Overnight: Partly cloudy, with a low around 61. South southwest wind 3 to 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Partly sunny, then gradually becoming sunny, with a high near 92. Light south southwest wind becoming southwest 9 to 14 mph in the morning. Winds could gust as high as 18 mph.

    High: 92 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 66. Southwest wind 7 to 9 mph.

    Low: 66 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Southwest wind 6 to 11 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 71 °F

    Clear then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 85. Southwest wind around 6 mph. Chance of precipitation is 80%.

    High: 85 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 70%.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 84. Light and variable wind becoming west southwest 8 to 13 mph in the morning.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. West northwest wind 8 to 15 mph, with gusts as high as 23 mph.

    Low: 54 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 61. South southwest wind 3 to 5 mph.
Columbus Day
Partly sunny, then gradually becoming sunny, with a high near 92. Light south southwest wind becoming southwest 9 to 14 mph in the morning. Winds could gust as high as 18 mph.
Monday Night
Clear, with a low around 66. Southwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 94. Southwest wind 6 to 11 mph.
Tuesday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind 5 to 7 mph. Chance of precipitation is 30%.
Wednesday
Showers and possibly a thunderstorm. High near 85. Southwest wind around 6 mph. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 84. Light and variable wind becoming west southwest 8 to 13 mph in the morning.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. West northwest wind 8 to 15 mph, with gusts as high as 23 mph.
Friday
Partly sunny, with a high near 66. Breezy, with a north northwest wind 17 to 24 mph, with gusts as high as 32 mph.
Friday Night
Mostly clear, with a low around 38. Breezy, with a north wind 15 to 20 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 23 mph.
Saturday
Sunny, with a high near 63. Northeast wind 6 to 8 mph.
Saturday Night
Clear, with a low around 36. Calm wind.
Sunday
Sunny, with a high near 69. Calm wind becoming south 5 to 7 mph in the morning.
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
1:26 am CDT Oct 12, 2026
Forecast Valid:
2am CDT Oct 12, 2026-6pm CDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation