National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

N/A

Humidity NA
Wind Speed Calm
Barometer 30.43 in
Dewpoint N/A
Visibility 10.00 mi
Last update 28 Nov 2:56 pm CST
Extended Forecast for

Nason IL

Winter Weather Advisory November 29, 06:00am until November 30, 12:00am
Click here for hazard details and duration
Winter Weather Advisory

  • This Afternoon

    This Afternoon: Sunny, with a high near 39. Calm wind.

    High: 39 °F

    Sunny

  • Tonight

    Tonight: A 50 percent chance of snow showers, mainly after 4am. Increasing clouds, with a low around 29. Calm wind becoming southeast 5 to 8 mph after midnight.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Saturday

    Saturday: Rain, possibly mixed with snow showers, becoming all rain after 2pm. High near 42. Southeast wind 9 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    High: 42 °F

    Snow Showers
    then
    Rain/Snow

  • Saturday Night

    Saturday Night: Rain showers, possibly mixing with snow after midnight, then gradually ending. Low around 26. South wind 15 to 18 mph becoming west northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 90%.

    Low: 26 °F

    Showers then
    Slight Chance
    Rain/Snow

  • Sunday

    Sunday: Mostly cloudy, with a high near 32. West northwest wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 32 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 21. North northwest wind 5 to 9 mph becoming light and variable after midnight.

    Low: 21 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of snow showers after noon. Mostly cloudy, with a high near 34. East northeast wind 3 to 6 mph.

    High: 34 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    Showers

  • Monday Night

    Monday Night: Snow showers likely, mainly before midnight. Cloudy, with a low around 22. Light and variable wind.

    Low: 22 °F

    Snow Showers
    Likely

  • Tuesday

    Tuesday: Partly sunny, with a high near 32. Northwest wind 3 to 7 mph.

    High: 32 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 39. Calm wind.
Tonight
A 50 percent chance of snow showers, mainly after 4am. Increasing clouds, with a low around 29. Calm wind becoming southeast 5 to 8 mph after midnight.
Saturday
Rain, possibly mixed with snow showers, becoming all rain after 2pm. High near 42. Southeast wind 9 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Saturday Night
Rain showers, possibly mixing with snow after midnight, then gradually ending. Low around 26. South wind 15 to 18 mph becoming west northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 90%.
Sunday
Mostly cloudy, with a high near 32. West northwest wind 10 to 17 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 21. North northwest wind 5 to 9 mph becoming light and variable after midnight.
Monday
A 20 percent chance of snow showers after noon. Mostly cloudy, with a high near 34. East northeast wind 3 to 6 mph.
Monday Night
Snow showers likely, mainly before midnight. Cloudy, with a low around 22. Light and variable wind.
Tuesday
Partly sunny, with a high near 32. Northwest wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 18. Calm wind.
Wednesday
Mostly sunny, with a high near 40. Calm wind becoming south southwest 5 to 8 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 22. South southwest wind around 5 mph becoming light and variable.
Thursday
Partly sunny, with a high near 35. Northwest wind 5 to 7 mph.
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:
3:16 pm CST Nov 28, 2025
Forecast Valid:
3pm CST Nov 28, 2025-6pm CST Dec 4, 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