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

83°F

28°C

Humidity 70%
Wind Speed W 6 mph
Barometer 29.94 in (1013.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 12 Sep 10:56 am CDT
Extended Forecast for

Dahlgren IL

  • Today

    Today: Sunny, with a high near 90. West wind around 6 mph.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 91. Calm wind becoming northwest 5 to 8 mph in the afternoon.

    High: 91 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms between 10pm and 1am. Partly cloudy, with a low around 63. Northeast wind 5 to 8 mph. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 88. East northeast wind around 9 mph.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. East southeast wind 5 to 7 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. South southwest wind 5 to 10 mph.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Light south southeast wind.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 96. Southwest wind 5 to 10 mph.

    High: 96 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 90. West wind around 6 mph.
Tonight
Mostly clear, with a low around 66. Calm wind.
Sunday
Mostly sunny, with a high near 91. Calm wind becoming northwest 5 to 8 mph in the afternoon.
Sunday Night
A slight chance of showers and thunderstorms between 10pm and 1am. Partly cloudy, with a low around 63. Northeast wind 5 to 8 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 88. East northeast wind around 9 mph.
Monday Night
Mostly clear, with a low around 67. East southeast wind 5 to 7 mph.
Tuesday
Sunny, with a high near 96. South southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 71. Light south southeast wind.
Wednesday
Sunny, with a high near 96. Southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 71. South wind 3 to 5 mph.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 93. West southwest wind 5 to 8 mph becoming northwest in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65. North wind around 5 mph becoming calm in the evening.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Light north northeast wind increasing to 5 to 9 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:
10:51 am CDT Sep 12, 2026
Forecast Valid:
11am CDT Sep 12, 2026-6pm CDT Sep 18, 2026
 
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Additional Resources

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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