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

N/A

Humidity NA
Wind Speed NE 9 mph
Barometer 30.35 in
Dewpoint N/A
Visibility 10.00 mi
Last update 4 Dec 11:56 am CST
Extended Forecast for

Nason IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 30. North northeast wind 5 to 8 mph.

    High: 30 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 17. Calm wind.

    Low: 17 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 41 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26. Southwest wind 3 to 6 mph.

    Low: 26 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 43. Calm wind becoming west around 5 mph.

    High: 43 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of freezing rain after midnight. Mostly cloudy, with a low around 28. Calm wind becoming northeast around 6 mph after midnight. Chance of precipitation is 20%.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance
    Freezing Rain

  • Sunday

    Sunday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 39. North wind 6 to 9 mph.

    High: 39 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 20. North wind 5 to 8 mph.

    Low: 20 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 36. North wind around 5 mph becoming light and variable in the afternoon.

    High: 36 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 30. North northeast wind 5 to 8 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 17. Calm wind.
Friday
Sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 26. Southwest wind 3 to 6 mph.
Saturday
Mostly sunny, with a high near 43. Calm wind becoming west around 5 mph.
Saturday Night
A slight chance of freezing rain after midnight. Mostly cloudy, with a low around 28. Calm wind becoming northeast around 6 mph after midnight. Chance of precipitation is 20%.
Sunday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 39. North wind 6 to 9 mph.
Sunday Night
Mostly cloudy, with a low around 20. North wind 5 to 8 mph.
Monday
Mostly sunny, with a high near 36. North wind around 5 mph becoming light and variable in the afternoon.
Monday Night
Partly cloudy, with a low around 23. Calm wind becoming south southwest 5 to 7 mph after midnight.
Tuesday
Mostly sunny, with a high near 45. Southwest wind 8 to 13 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 32. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Wednesday
A chance of showers. Mostly cloudy, with a high near 49. West wind 10 to 14 mph, with gusts as high as 20 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:
10:51 am CST Dec 4, 2025
Forecast Valid:
12pm CST Dec 4, 2025-6pm CST Dec 10, 2025
 
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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