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 NW 5 mph
Barometer 30.04 in
Dewpoint N/A
Visibility 8.00 mi
Last update 7 Dec 11:56 am CST
Extended Forecast for

Nason IL

  • This Afternoon

    This Afternoon: A slight chance of drizzle before 5pm. Increasing clouds, with a high near 45. North wind 6 to 11 mph.

    High: 45 °F

    Slight Chance
    Drizzle

  • Tonight

    Tonight: Mostly cloudy, with a low around 25. North wind 7 to 10 mph.

    Low: 25 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 37. North wind around 6 mph becoming calm in the afternoon.

    High: 37 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Light south wind becoming south southwest 5 to 10 mph after midnight. Winds could gust as high as 18 mph.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. South southwest wind 11 to 16 mph, with gusts as high as 23 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. South southwest wind around 17 mph, with gusts as high as 28 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 51. West southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 51 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 28. Northwest wind 5 to 7 mph becoming light and variable.

    Low: 28 °F

    Slight Chance
    Rain then
    Chance
    Rain/Snow

  • Thursday

    Thursday: A chance of rain and snow. Mostly cloudy, with a high near 38. East wind 6 to 8 mph becoming north in the afternoon.

    High: 38 °F

    Chance
    Rain/Snow

Detailed Forecast

This Afternoon
A slight chance of drizzle before 5pm. Increasing clouds, with a high near 45. North wind 6 to 11 mph.
Tonight
Mostly cloudy, with a low around 25. North wind 7 to 10 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 37. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Partly cloudy, with a low around 25. Light south wind becoming south southwest 5 to 10 mph after midnight. Winds could gust as high as 18 mph.
Tuesday
Mostly sunny, with a high near 49. South southwest wind 11 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 41. South southwest wind around 17 mph, with gusts as high as 28 mph.
Wednesday
Partly sunny, with a high near 51. West southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
A slight chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 28. Northwest wind 5 to 7 mph becoming light and variable.
Thursday
A chance of rain and snow. Mostly cloudy, with a high near 38. East wind 6 to 8 mph becoming north in the afternoon.
Thursday Night
A slight chance of rain before midnight. Mostly cloudy, with a low around 19. North northwest wind 6 to 10 mph.
Friday
Mostly sunny, with a high near 28. Northwest wind 10 to 13 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 8. Northwest wind around 10 mph.
Saturday
Mostly sunny, with a high near 24. West northwest wind 7 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:
10:56 am CST Dec 7, 2025
Forecast Valid:
12pm CST Dec 7, 2025-6pm CST Dec 13, 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