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.

Overcast

N/A

Humidity NA
Wind Speed NE 6 mph
Barometer 30.48 in
Dewpoint N/A
Visibility 10.00 mi
Last update 1 Dec 12:56 am CST
Extended Forecast for

Nason IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 21. Light northeast wind.

    Low: 21 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of snow showers after 4pm. Cloudy, with a high near 36. North northeast wind 3 to 8 mph.

    High: 36 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    Showers

  • Monday Night

    Monday Night: Snow showers, mainly before 2am. Low around 22. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    Low: 22 °F

    Snow Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 33. Northwest wind 5 to 7 mph becoming calm in the afternoon.

    High: 33 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 21. Calm wind becoming south around 5 mph after midnight.

    Low: 21 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 41. South wind 5 to 10 mph.

    High: 41 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. Light and variable wind becoming north northwest 5 to 10 mph in the evening.

    Low: 19 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 28. North northwest wind 5 to 10 mph becoming light north in the afternoon.

    High: 28 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A slight chance of snow showers after midnight. Mostly cloudy, with a low around 16. Calm wind.

    Low: 16 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 21. Light northeast wind.
Monday
A 20 percent chance of snow showers after 4pm. Cloudy, with a high near 36. North northeast wind 3 to 8 mph.
Monday Night
Snow showers, mainly before 2am. Low around 22. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 80%. New snow accumulation of around an inch possible.
Tuesday
Partly sunny, with a high near 33. Northwest wind 5 to 7 mph becoming calm in the afternoon.
Tuesday Night
Mostly clear, with a low around 21. Calm wind becoming south around 5 mph after midnight.
Wednesday
Mostly sunny, with a high near 41. South wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 19. Light and variable wind becoming north northwest 5 to 10 mph in the evening.
Thursday
Partly sunny, with a high near 28. North northwest wind 5 to 10 mph becoming light north in the afternoon.
Thursday Night
A slight chance of snow showers after midnight. Mostly cloudy, with a low around 16. Calm wind.
Friday
A chance of snow showers before noon, then a chance of rain and snow showers. Mostly cloudy, with a high near 34. Calm wind becoming south southeast around 6 mph.
Friday Night
A chance of freezing rain. Mostly cloudy, with a low around 25. Calm wind becoming west around 5 mph after midnight.
Saturday
Mostly cloudy, with a high near 39. West wind 5 to 8 mph becoming south southwest in the afternoon.
Saturday Night
A slight chance of showers. Mostly cloudy, with a low around 27. Light and variable wind becoming west around 6 mph after midnight.
Sunday
Mostly cloudy, with a high near 39. West wind 6 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Nason IL
 38.18°N 88.98°W
Last Update:
10:21 pm CST Nov 30, 2025
Forecast Valid:
1am CST Dec 1, 2025-6pm CST Dec 7, 2025
 
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