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

86°F

30°C

Humidity 19%
Wind Speed Calm
Barometer 30.08 in (1018.8 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 8 Oct 1:56 pm CDT
Extended Forecast for

Dahlgren IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 86. Light east southeast wind.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 50. Calm wind.

    Low: 50 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 88. Light south southeast wind becoming south 5 to 10 mph in the morning.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. Southeast wind 3 to 6 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: A 50 percent chance of showers after 10am. Partly sunny, with a high near 79. Light southeast wind becoming east 6 to 11 mph in the morning.

    High: 79 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 58. East wind 9 to 17 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    Low: 58 °F

    Showers

  • Sunday

    Sunday: A 40 percent chance of showers before 1pm. Mostly cloudy, with a high near 75. East northeast wind 7 to 9 mph becoming north northwest in the afternoon.

    High: 75 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 87. Light southwest wind becoming south southwest 6 to 11 mph in the afternoon.

    High: 87 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 86. Light east southeast wind.
Tonight
Clear, with a low around 50. Calm wind.
Friday
Sunny, with a high near 88. Light south southeast wind becoming south 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 58. Southeast wind 3 to 6 mph.
Saturday
A 50 percent chance of showers after 10am. Partly sunny, with a high near 79. Light southeast wind becoming east 6 to 11 mph in the morning.
Saturday Night
Showers and possibly a thunderstorm. Low around 58. East wind 9 to 17 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Sunday
A 40 percent chance of showers before 1pm. Mostly cloudy, with a high near 75. East northeast wind 7 to 9 mph becoming north northwest in the afternoon.
Sunday Night
Mostly clear, with a low around 57. Calm wind.
Columbus Day
Sunny, with a high near 87. Light southwest wind becoming south southwest 6 to 11 mph in the afternoon.
Monday Night
Clear, with a low around 63. South wind 8 to 10 mph.
Tuesday
Sunny, with a high near 86. West wind 9 to 13 mph.
Tuesday Night
Partly cloudy, with a low around 57. North northwest wind around 7 mph becoming east northeast after midnight.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 80. East northeast wind 6 to 10 mph becoming south southeast in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.7°W
Last Update:
1:26 pm CDT Oct 8, 2026
Forecast Valid:
2pm CDT Oct 8, 2026-6pm CDT Oct 14, 2026
 
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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