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.

Mostly Cloudy with Haze

N/A

Humidity NA
Wind Speed Calm
Barometer 29.96 in
Dewpoint N/A
Visibility 6.00 mi
Last update 7 Dec 4:56 am CST
Extended Forecast for

Dahlgren IL

  • Today

    Today: A slight chance of showers before 8am, then a slight chance of drizzle between 8am and 5pm. Mostly cloudy, with a high near 44. Light and variable wind becoming north 6 to 11 mph in the morning. Chance of precipitation is 20%.

    High: 44 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Cloudy, with a low around 24. North wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 24 °F

    Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 37 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 24. Light south southeast wind becoming south southwest 6 to 11 mph after midnight. Winds could gust as high as 18 mph.

    Low: 24 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. South southwest wind 13 to 16 mph, with gusts as high as 23 mph.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. Southwest wind 15 to 18 mph, with gusts as high as 29 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 50. Southwest wind 9 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph.

    High: 50 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain before midnight, then a slight 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
    Slight 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

Today
A slight chance of showers before 8am, then a slight chance of drizzle between 8am and 5pm. Mostly cloudy, with a high near 44. Light and variable wind becoming north 6 to 11 mph in the morning. Chance of precipitation is 20%.
Tonight
Cloudy, with a low around 24. North wind 7 to 11 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Partly cloudy, with a low around 24. Light south southeast wind becoming south southwest 6 to 11 mph after midnight. Winds could gust as high as 18 mph.
Tuesday
Mostly sunny, with a high near 48. South southwest wind 13 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 41. Southwest wind 15 to 18 mph, with gusts as high as 29 mph.
Wednesday
Partly sunny, with a high near 50. Southwest wind 9 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph.
Wednesday Night
A slight chance of rain before midnight, then a slight 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
Partly 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 7. Northwest wind 8 to 10 mph.
Saturday
Partly sunny, with a high near 23. West northwest wind 7 to 10 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.7°W
Last Update:
5:06 am CST Dec 7, 2025
Forecast Valid:
5am CST Dec 7, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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