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 SW 7 mph
Barometer 29.91 in
Dewpoint N/A
Visibility 10.00 mi
Last update 14 Nov 11:56 pm CST
Extended Forecast for

Nason IL

  • Overnight

    Overnight: Partly cloudy, with a low around 59. South southwest wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 77. Southwest wind 11 to 16 mph, with gusts as high as 22 mph.

    High: 77 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 45. West southwest wind 6 to 9 mph becoming north after midnight.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 60. North northwest wind 3 to 7 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. Calm wind.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers after noon. Mostly sunny, with a high near 59. Light east northeast wind becoming southeast 5 to 10 mph in the morning.

    High: 59 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely. Mostly cloudy, with a low around 46. East southeast wind around 9 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers before noon. Partly sunny, with a high near 63. East southeast wind 7 to 11 mph becoming west northwest in the afternoon.

    High: 63 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers after midnight. Mostly cloudy, with a low around 40. Northeast wind 3 to 6 mph.

    Low: 40 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 59. South southwest wind 9 to 13 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 77. Southwest wind 11 to 16 mph, with gusts as high as 22 mph.
Saturday Night
Mostly clear, with a low around 45. West southwest wind 6 to 9 mph becoming north after midnight.
Sunday
Sunny, with a high near 60. North northwest wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 35. Calm wind.
Monday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 59. Light east northeast wind becoming southeast 5 to 10 mph in the morning.
Monday Night
Showers likely. Mostly cloudy, with a low around 46. East southeast wind around 9 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers before noon. Partly sunny, with a high near 63. East southeast wind 7 to 11 mph becoming west northwest in the afternoon.
Tuesday Night
A slight chance of showers after midnight. Mostly cloudy, with a low around 40. Northeast wind 3 to 6 mph.
Wednesday
A chance of showers, mainly after noon. Partly sunny, with a high near 59. East wind 5 to 7 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 44. East wind 5 to 8 mph becoming south southeast after midnight.
Thursday
Showers likely. Mostly cloudy, with a high near 65. South southeast wind 8 to 11 mph becoming west southwest in the afternoon.
Thursday Night
Showers likely. Mostly cloudy, with a low around 45. West southwest wind 7 to 9 mph becoming southeast after midnight.
Friday
A chance of showers. Partly sunny, with a high near 60. Southeast wind 9 to 11 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:
7:47 pm CST Nov 14, 2025
Forecast Valid:
12am CST Nov 15, 2025-6pm CST Nov 21, 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