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 64%
Wind Speed SW 6 mph
Barometer 30.21 in (1023.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 4 Oct 9:56 am CDT
Extended Forecast for

Nason IL

  • Today

    Today: Sunny, with a high near 87. Light southwest wind becoming south southeast 5 to 9 mph in the afternoon.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 54. South southeast wind around 5 mph becoming calm in the evening.

    Low: 54 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 87. South wind 5 to 11 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. South southeast wind around 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 85. South southeast wind 5 to 8 mph. Chance of precipitation is 50%.

    High: 85 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, with thunderstorms also possible after 10pm. Partly cloudy, with a low around 65. 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 80. Calm wind becoming northwest 5 to 9 mph in the morning. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 57. North wind 7 to 9 mph.

    Low: 57 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 75. Northeast wind 9 to 13 mph.

    High: 75 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 87. Light southwest wind becoming south southeast 5 to 9 mph in the afternoon.
Tonight
Clear, with a low around 54. South southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 87. South wind 5 to 11 mph.
Sunday Night
Mostly clear, with a low around 63. South southeast wind around 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 85. South southeast wind 5 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. 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 80. 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 57. North wind 7 to 9 mph.
Wednesday
Sunny, with a high near 75. Northeast wind 9 to 13 mph.
Wednesday Night
Mostly clear, with a low around 49. East northeast wind 6 to 9 mph.
Thursday
Sunny, with a high near 74. East wind 6 to 8 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:
Nason IL
 38.18°N 88.98°W
Last Update:
8:47 am CDT Oct 4, 2025
Forecast Valid:
10am 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