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

76°F

24°C

Humidity 43%
Wind Speed SW 15 G 23 mph
Barometer 29.90 in (1012.6 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 31 Mar 7:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 64. South southwest wind 6 to 11 mph, with gusts as high as 23 mph.

    Low: 64 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. South wind 5 to 8 mph.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Breezy, with a south wind 15 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 60%.

    High: 79 °F

    Breezy.
    Slight Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 63. Breezy, with a south southwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

    Low: 63 °F

    Showers and
    Breezy

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. South wind 8 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    Low: 58 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. Mostly cloudy, with a high near 69. South southwest wind 14 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 69 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 1am. Mostly cloudy, with a low around 39. Northwest wind 11 to 13 mph, with gusts as high as 22 mph.

    Low: 39 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 64. South southwest wind 6 to 11 mph, with gusts as high as 23 mph.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. South wind 5 to 8 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Thursday
A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Breezy, with a south wind 15 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 60%.
Thursday Night
Showers and possibly a thunderstorm. Low around 63. Breezy, with a south southwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. South wind 8 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Saturday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 69. South southwest wind 14 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph.
Saturday Night
A chance of showers, mainly before 1am. Mostly cloudy, with a low around 39. Northwest wind 11 to 13 mph, with gusts as high as 22 mph.
Sunday
Mostly sunny, with a high near 55. Northwest wind 11 to 15 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 34. North wind 5 to 9 mph.
Monday
Sunny, with a high near 61. North northeast wind 5 to 8 mph becoming east in the afternoon.
Monday Night
Mostly clear, with a low around 39. South southwest wind around 6 mph.
Tuesday
Sunny, with a high near 67. Southwest wind 6 to 10 mph becoming northwest in the afternoon.
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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:
6:26 pm CDT Mar 31, 2026
Forecast Valid:
8pm CDT Mar 31, 2026-6pm CDT Apr 7, 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