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

30°F

-1°C

Humidity 75%
Wind Speed N 3 mph
Barometer 30.13 in (1021.2 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 21 Feb 5:56 am CST
Extended Forecast for

4 Miles SSE Dahlgren IL

  • Today

    Today: A chance of rain and snow showers before noon, then a chance of sprinkles and flurries between noon and 1pm. Partly sunny, with a high near 41. North northwest wind 5 to 8 mph. Chance of precipitation is 20%.

    High: 41 °F

    Chance
    Sprinkles/Snow

  • Tonight

    Tonight: Mostly clear, with a low around 23. Northwest wind 7 to 14 mph, with gusts as high as 24 mph.

    Low: 23 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 33. Northwest wind 14 to 18 mph, with gusts as high as 26 mph.

    High: 33 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18. Northwest wind around 15 mph, with gusts as high as 24 mph.

    Low: 18 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 33. Northwest wind 8 to 15 mph, with gusts as high as 23 mph.

    High: 33 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18. Northwest wind around 6 mph becoming calm in the evening.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 47. South southwest wind 5 to 15 mph, with gusts as high as 22 mph.

    High: 47 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 60. Southwest wind 11 to 15 mph, with gusts as high as 22 mph.

    High: 60 °F

    Partly Sunny

Detailed Forecast

Today
A chance of rain and snow showers before noon, then a chance of sprinkles and flurries between noon and 1pm. Partly sunny, with a high near 41. North northwest wind 5 to 8 mph. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 23. Northwest wind 7 to 14 mph, with gusts as high as 24 mph.
Sunday
Mostly sunny, with a high near 33. Northwest wind 14 to 18 mph, with gusts as high as 26 mph.
Sunday Night
Partly cloudy, with a low around 18. Northwest wind around 15 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 33. Northwest wind 8 to 15 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 18. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 47. South southwest wind 5 to 15 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly cloudy, with a low around 39. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Wednesday
Partly sunny, with a high near 60. Southwest wind 11 to 15 mph, with gusts as high as 22 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 40. South southwest wind around 10 mph becoming north northwest after midnight.
Thursday
A chance of showers. Partly sunny, with a high near 54. West northwest wind 7 to 10 mph.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 31. Northwest wind around 6 mph becoming southwest after midnight.
Friday
Sunny, with a high near 58. South southwest wind 6 to 9 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Dahlgren IL
 38.15°N 88.67°W
Last Update:
4:26 am CST Feb 21, 2026
Forecast Valid:
6am CST Feb 21, 2026-6pm CST Feb 27, 2026
 
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