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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Nason IL

  • Tonight

    Tonight: Partly cloudy, with a steady temperature around 29. West southwest wind 3 to 6 mph.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Sunny during the morning, then mostly cloudy during the afternoon, with a high near 44. West southwest wind 6 to 11 mph becoming north northwest 12 to 17 mph in the afternoon. Winds could gust as high as 32 mph.

    High: 44 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 21. North northwest wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 21 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 33. North northeast wind around 6 mph becoming calm in the afternoon.

    High: 33 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 21. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 21 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47. South wind 5 to 8 mph.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 27. Light and variable wind.

    Low: 27 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 54. Calm wind becoming south around 5 mph.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. South wind 3 to 6 mph.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a steady temperature around 29. West southwest wind 3 to 6 mph.
Friday
Sunny during the morning, then mostly cloudy during the afternoon, with a high near 44. West southwest wind 6 to 11 mph becoming north northwest 12 to 17 mph in the afternoon. Winds could gust as high as 32 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 21. North northwest wind 6 to 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 33. North northeast wind around 6 mph becoming calm in the afternoon.
Saturday Night
Mostly cloudy, with a low around 21. Calm wind becoming south southeast around 6 mph after midnight.
Sunday
Mostly sunny, with a high near 47. South wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 27. Light and variable wind.
Monday
Sunny, with a high near 54. Calm wind becoming south around 5 mph.
Monday Night
Mostly clear, with a low around 38. South wind 3 to 6 mph.
Tuesday
Partly sunny, with a high near 61. South wind 6 to 9 mph.
Tuesday Night
A chance of showers. Cloudy, with a low around 44. Southwest wind around 7 mph.
Wednesday
A chance of showers. Mostly cloudy, with a high near 55. West southwest wind 7 to 9 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 37. West northwest wind around 6 mph.
Thursday
A chance of showers. Mostly cloudy, with a high near 50. West northwest wind 6 to 9 mph becoming east southeast 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:
8:17 pm CST Feb 5, 2026
Forecast Valid:
9pm CST Feb 5, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation