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.

Partly Cloudy

74°F

23°C

Humidity 79%
Wind Speed NE 3 mph
Barometer 29.96 in (1014.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 26 Aug 10:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

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

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Calm wind becoming north northwest 5 to 8 mph in the afternoon.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. North wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87. Calm wind becoming north northeast around 6 mph in the afternoon.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 59. North northeast wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 90. Calm wind.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. Light south southeast wind.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 95. Calm wind becoming south southwest 5 to 9 mph in the morning.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71. South wind 5 to 7 mph.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 66. Calm wind.
Thursday
Sunny, with a high near 88. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 62. North wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 87. Calm wind becoming north northeast around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 59. North northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 90. Calm wind.
Saturday Night
Mostly clear, with a low around 64. Light south southeast wind.
Sunday
Sunny, with a high near 95. Calm wind becoming south southwest 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 71. South wind 5 to 7 mph.
Monday
Sunny and hot, with a high near 97. Southwest wind 5 to 13 mph.
Monday Night
Mostly clear, with a low around 73. South wind 3 to 7 mph.
Tuesday
Sunny and hot, with a high near 98. Southwest wind 3 to 8 mph.
Tuesday Night
Mostly clear, with a low around 74. South southwest wind around 5 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 98. Calm wind becoming southwest 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:
9:16 pm CDT Aug 26, 2026
Forecast Valid:
11pm CDT Aug 26, 2026-6pm CDT Sep 2, 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