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

68°F

20°C

Humidity 42%
Wind Speed NE 5 mph
Barometer 30.30 in (1026.3 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 9 Oct 5:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: Clear, with a low around 40. East wind around 6 mph becoming calm in the evening.

    Low: 40 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 74. Calm wind.

    High: 74 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 78. Calm wind becoming north around 5 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 49. Calm wind.

    Low: 49 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79. Calm wind becoming south southeast around 6 mph in the morning.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 83. Calm wind becoming south southwest around 6 mph in the morning.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57. Light and variable wind.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 40. East wind around 6 mph becoming calm in the evening.
Friday
Sunny, with a high near 74. Calm wind.
Friday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 54. Calm wind.
Saturday
Mostly sunny, with a high near 78. Calm wind becoming north around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 49. Calm wind.
Sunday
Sunny, with a high near 79. Calm wind becoming south southeast around 6 mph in the morning.
Sunday Night
Mostly clear, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.
Columbus Day
Mostly sunny, with a high near 83. Calm wind becoming south southwest around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 57. Light and variable wind.
Tuesday
Mostly sunny, with a high near 80. North wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 55. North wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 77. North northeast wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 50. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 78. Light and variable wind becoming south southeast 5 to 8 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.7°W
Last Update:
6:01 pm CDT Oct 9, 2025
Forecast Valid:
6pm CDT Oct 9, 2025-6pm CDT Oct 16, 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