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.

Overcast

N/A

Humidity NA
Wind Speed S 14 mph
Barometer 30.09 in
Dewpoint N/A
Visibility 10.00 mi
Last update 9 Dec 3:56 am CST
Extended Forecast for

Nason IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 49. South southwest wind 11 to 18 mph, with gusts as high as 24 mph.

    High: 49 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 48 by 3am. Southwest wind 16 to 18 mph, with gusts as high as 29 mph.

    Low: 41 °F⇑

    Mostly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a temperature rising to near 48 by 9am, then falling to around 36 during the remainder of the day. Breezy, with a northwest wind 13 to 23 mph, with gusts as high as 31 mph.

    High: 48 °F⇓

    Increasing
    Clouds and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27. Northwest wind 5 to 10 mph becoming light west northwest after midnight.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 41. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 41 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 30. East wind 5 to 7 mph.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 45. Southeast wind 7 to 10 mph becoming northwest in the afternoon.

    High: 45 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 20. North northwest wind 7 to 9 mph.

    Low: 20 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 32. North wind around 7 mph.

    High: 32 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 49. South southwest wind 11 to 18 mph, with gusts as high as 24 mph.
Tonight
Mostly cloudy, with a temperature rising to around 48 by 3am. Southwest wind 16 to 18 mph, with gusts as high as 29 mph.
Wednesday
Increasing clouds, with a temperature rising to near 48 by 9am, then falling to around 36 during the remainder of the day. Breezy, with a northwest wind 13 to 23 mph, with gusts as high as 31 mph.
Wednesday Night
Mostly cloudy, with a low around 27. Northwest wind 5 to 10 mph becoming light west northwest after midnight.
Thursday
Mostly cloudy, with a high near 41. Light and variable wind becoming west 5 to 7 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 30. East wind 5 to 7 mph.
Friday
Partly sunny, with a high near 45. Southeast wind 7 to 10 mph becoming northwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 20. North northwest wind 7 to 9 mph.
Saturday
Partly sunny, with a high near 32. North wind around 7 mph.
Saturday Night
Mostly cloudy, with a low around 11. North wind around 6 mph.
Sunday
Mostly sunny, with a high near 25. North wind 6 to 8 mph.
Sunday Night
Partly cloudy, with a low around 14. North northeast wind around 6 mph becoming southeast after midnight.
Monday
A chance of rain and snow showers. Partly sunny, with a high near 36. Southeast wind 6 to 9 mph becoming south southwest in the afternoon.
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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:
3:16 am CST Dec 9, 2025
Forecast Valid:
4am CST Dec 9, 2025-6pm CST Dec 15, 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