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Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

87°F

31°C

Humidity 50%
Wind Speed SW 5 mph
Barometer 30.03 in (1016.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 18 Aug 2:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: A 10 percent chance of showers after 5am. Increasing clouds, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Showers and thunderstorms, mainly before 2pm. High near 83. Light and variable wind. Chance of precipitation is 80%.

    High: 83 °F

    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 66. Calm wind. Chance of precipitation is 60%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Partly sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 84 °F

    Chance
    T-storms

  • Thursday Night

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

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 64. Calm wind.

    Low: 64 °F

    Clear

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 86. Calm wind becoming northwest 5 to 9 mph in the afternoon.

    High: 86 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 86. Calm wind.
Tonight
A 10 percent chance of showers after 5am. Increasing clouds, with a low around 68. Calm wind.
Wednesday
Showers and thunderstorms, mainly before 2pm. High near 83. Light and variable wind. Chance of precipitation is 80%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 66. Calm wind. Chance of precipitation is 60%.
Thursday
A 30 percent chance of showers and thunderstorms, mainly before 7am. Partly sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 63. Calm wind.
Friday
Sunny, with a high near 86. Calm wind.
Friday Night
Clear, with a low around 64. Calm wind.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 86. Calm wind becoming northwest 5 to 9 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 63. Light north wind.
Sunday
Sunny, with a high near 84. Light north wind.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 62. Calm wind.
Monday
A slight chance of showers. Mostly sunny, with a high near 85. Calm wind becoming south southeast around 5 mph 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:
2:11 pm CDT Aug 18, 2026
Forecast Valid:
3pm CDT Aug 18, 2026-6pm CDT Aug 24, 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