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.

A Few Clouds

N/A

Humidity NA
Wind Speed SW 6 mph
Barometer 30.02 in
Dewpoint N/A
Visibility 9.00 mi
Last update 6 Dec 8:56 am CST
Extended Forecast for

Nason IL

  • Today

    Today: Mostly sunny, with a high near 45. Light and variable wind.

    High: 45 °F

    Mostly Sunny

  • Tonight

    Tonight: Cloudy, with a low around 33. Calm wind becoming south around 5 mph after midnight.

    Low: 33 °F

    Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 46. South wind 5 to 10 mph becoming north in the afternoon.

    High: 46 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 22. North wind 6 to 10 mph.

    Low: 22 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 36. North wind around 6 mph becoming calm in the afternoon.

    High: 36 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 23. Calm wind becoming south southwest 5 to 9 mph after midnight.

    Low: 23 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. South southwest wind 10 to 14 mph, with gusts as high as 20 mph.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. Southwest wind 13 to 16 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers before noon. Partly sunny, with a high near 48. West southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 48 °F

    Slight Chance
    Showers then
    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 45. Light and variable wind.
Tonight
Cloudy, with a low around 33. Calm wind becoming south around 5 mph after midnight.
Sunday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 46. South wind 5 to 10 mph becoming north in the afternoon.
Sunday Night
A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 22. North wind 6 to 10 mph.
Monday
Mostly sunny, with a high near 36. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 23. Calm wind becoming south southwest 5 to 9 mph after midnight.
Tuesday
Mostly sunny, with a high near 48. South southwest wind 10 to 14 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 38. Southwest wind 13 to 16 mph, with gusts as high as 25 mph.
Wednesday
A slight chance of showers before noon. Partly sunny, with a high near 48. West southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
Mostly cloudy, with a low around 27. Northwest wind 6 to 9 mph becoming northeast after midnight.
Thursday
A chance of rain and snow showers. Mostly cloudy, with a high near 40. Northeast wind 6 to 10 mph becoming southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 23. East wind 6 to 8 mph becoming north northwest in the evening.
Friday
Partly sunny, with a high near 31. North northwest wind 8 to 10 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:
8:06 am CST Dec 6, 2025
Forecast Valid:
9am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation