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

69°F

21°C

Humidity 47%
Wind Speed Calm
Barometer 30.06 in (1018.3 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 8 Oct 6:56 pm CDT
Extended Forecast for

3 Miles SW Dahlgren IL

  • Tonight

    Tonight: Clear, with a low around 51. Calm wind.

    Low: 51 °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 before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then showers after 4am. Low around 58. East wind 10 to 18 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

  • Monday Night

    Monday Night: Clear, with a low around 63. South wind 8 to 10 mph.

    Low: 63 °F

    Clear

Detailed Forecast

Tonight
Clear, with a low around 51. 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 before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then showers after 4am. Low around 58. East wind 10 to 18 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 85. West wind 9 to 13 mph.
Tuesday Night
Partly cloudy, with a low around 58. 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.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 59. Southeast wind 5 to 7 mph.
Thursday
A chance of showers. Mostly sunny, with a high near 82. South southwest wind 7 to 15 mph, with gusts as high as 21 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Dahlgren IL
 38.17°N 88.72°W
Last Update:
6:30 pm CDT Oct 8, 2026
Forecast Valid:
7pm CDT Oct 8, 2026-6pm CDT Oct 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation