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

76°F

24°C

Humidity 32%
Wind Speed S 6 mph
Barometer 30.10 in (1019.5 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 6 Oct 12:56 pm CDT
Extended Forecast for

Dahlgren IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 77. South southeast wind 3 to 5 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 52. Calm wind.

    Low: 52 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Light southwest wind becoming west southwest 5 to 9 mph in the morning.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. Southwest wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Calm wind becoming north 5 to 7 mph in the morning.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 51. Light north northeast wind.

    Low: 51 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 83. Calm wind becoming east southeast 5 to 7 mph in the morning.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 56. East southeast wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 87. Light south southeast wind becoming south 6 to 11 mph in the morning.

    High: 87 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 77. South southeast wind 3 to 5 mph.
Tonight
Clear, with a low around 52. Calm wind.
Wednesday
Sunny, with a high near 87. Light southwest wind becoming west southwest 5 to 9 mph in the morning.
Wednesday Night
Mostly clear, with a low around 56. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 84. Calm wind becoming north 5 to 7 mph in the morning.
Thursday Night
Clear, with a low around 51. Light north northeast wind.
Friday
Sunny, with a high near 83. Calm wind becoming east southeast 5 to 7 mph in the morning.
Friday Night
Clear, with a low around 56. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 87. Light south southeast wind becoming south 6 to 11 mph in the morning.
Saturday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58. Southeast wind around 6 mph.
Sunday
A chance of showers. Partly sunny, with a high near 77. East wind 7 to 11 mph.
Sunday Night
Partly cloudy, with a low around 57. East northeast wind around 5 mph becoming calm in the evening.
Columbus Day
Partly sunny, with a high near 82. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.67°W
Last Update:
1:16 pm CDT Oct 6, 2026
Forecast Valid:
1pm CDT Oct 6, 2026-6pm CDT Oct 12, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation