National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

28°F

-2°C

Humidity 92%
Wind Speed Calm
Barometer 30.32 in (1027.5 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 12 Mar 6:56 am CDT
Extended Forecast for

Dahlgren IL

  • Today

    Today: Sunny, with a high near 53. Light west northwest wind becoming west 5 to 9 mph in the morning.

    High: 53 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 41. Breezy, with a south wind 8 to 13 mph increasing to 18 to 23 mph after midnight. Winds could gust as high as 32 mph.

    Low: 41 °F

    Mostly Clear
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy, with a west wind 15 to 21 mph, with gusts as high as 29 mph.

    High: 62 °F

    Partly Sunny
    and Breezy
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 35. West northwest wind 5 to 7 mph becoming east northeast after midnight.

    Low: 35 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64. East northeast wind 7 to 11 mph becoming south southeast in the afternoon.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 52. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 69. Breezy, with a south wind 14 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 70%.

    High: 69 °F

    Breezy.
    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Rain and snow showers likely, mainly before 1am. Some thunder is also possible. Mostly cloudy, with a low around 26. Breezy, with a west northwest wind around 25 mph, with gusts as high as 36 mph.

    Low: 26 °F

    Rain/Snow
    Likely and
    Breezy

  • Monday

    Monday: Partly sunny, with a high near 35. Breezy, with a west northwest wind 18 to 23 mph, with gusts as high as 30 mph.

    High: 35 °F

    Partly Sunny
    and Breezy

Detailed Forecast

Today
Sunny, with a high near 53. Light west northwest wind becoming west 5 to 9 mph in the morning.
Tonight
Mostly clear, with a low around 41. Breezy, with a south wind 8 to 13 mph increasing to 18 to 23 mph after midnight. Winds could gust as high as 32 mph.
Friday
Mostly sunny, with a high near 62. Breezy, with a west wind 15 to 21 mph, with gusts as high as 29 mph.
Friday Night
Partly cloudy, with a low around 35. West northwest wind 5 to 7 mph becoming east northeast after midnight.
Saturday
Mostly sunny, with a high near 64. East northeast wind 7 to 11 mph becoming south southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 52. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.
Sunday
A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 69. Breezy, with a south wind 14 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 70%.
Sunday Night
Rain and snow showers likely, mainly before 1am. Some thunder is also possible. Mostly cloudy, with a low around 26. Breezy, with a west northwest wind around 25 mph, with gusts as high as 36 mph.
Monday
Partly sunny, with a high near 35. Breezy, with a west northwest wind 18 to 23 mph, with gusts as high as 30 mph.
Monday Night
Mostly clear, with a low around 15. Northwest wind 8 to 15 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 39. Northwest wind around 7 mph becoming west southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 28. South southeast wind 3 to 7 mph.
Wednesday
Partly sunny, with a high near 55. South wind 8 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:
6:36 am CDT Mar 12, 2026
Forecast Valid:
7am CDT Mar 12, 2026-6pm CDT Mar 18, 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