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.

Fog/Mist

57°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 30.18 in (1021.9 mb)
Dewpoint 57°F (14°C)
Visibility 6.00 mi
Last update 4 Oct 3:56 am CDT
Extended Forecast for

Mount Vernon IL

  • Today

    Today: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light south wind becoming south southeast 5 to 10 mph in the morning.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Clear, with a low around 53. Southeast wind 3 to 5 mph.

    Low: 53 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 87. Light southeast wind becoming south 8 to 13 mph in the morning.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. South southeast wind 3 to 6 mph.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly sunny, with a high near 86. South wind 3 to 8 mph. Chance of precipitation is 50%.

    High: 86 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, with thunderstorms also possible after 10pm. Partly cloudy, with a low around 65. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 65 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming northwest 5 to 9 mph in the morning. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 56. North northeast wind 6 to 8 mph.

    Low: 56 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 74. Northeast wind 8 to 11 mph.

    High: 74 °F

    Sunny

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light south wind becoming south southeast 5 to 10 mph in the morning.
Tonight
Clear, with a low around 53. Southeast wind 3 to 5 mph.
Sunday
Sunny, with a high near 87. Light southeast wind becoming south 8 to 13 mph in the morning.
Sunday Night
Mostly clear, with a low around 63. South southeast wind 3 to 6 mph.
Monday
A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly sunny, with a high near 86. South wind 3 to 8 mph. Chance of precipitation is 50%.
Monday Night
A chance of showers, with thunderstorms also possible after 10pm. Partly cloudy, with a low around 65. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.
Tuesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming northwest 5 to 9 mph in the morning. Chance of precipitation is 60%.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 56. North northeast wind 6 to 8 mph.
Wednesday
Sunny, with a high near 74. Northeast wind 8 to 11 mph.
Wednesday Night
Mostly clear, with a low around 48. Northeast wind around 7 mph.
Thursday
Sunny, with a high near 74. East wind around 7 mph.
Thursday Night
Mostly clear, with a low around 47. East wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 76. Calm wind becoming south 5 to 7 mph in the morning.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.33°N 88.91°W
Last Update:
1:31 am CDT Oct 4, 2025
Forecast Valid:
4am CDT Oct 4, 2025-6pm CDT Oct 10, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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