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

91°F

33°C

Humidity 54%
Wind Speed S 7 mph
Barometer 30.11 in (1019.8 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 7 Aug 3:56 pm CDT
Extended Forecast for

Dahlgren IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 91. Calm wind.

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 93. Calm wind becoming south 5 to 7 mph in the morning.

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72. South southeast wind 3 to 5 mph.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 93. South wind 5 to 8 mph.

    High: 93 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 72. South wind around 6 mph becoming calm in the evening.

    Low: 72 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 93. South wind 3 to 7 mph.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. South southeast wind around 6 mph becoming calm in the evening.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 92. South wind 3 to 6 mph.

    High: 92 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 91. Calm wind.
Tonight
Partly cloudy, with a low around 72. Calm wind.
Friday
Sunny, with a high near 93. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 72. South southeast wind 3 to 5 mph.
Saturday
Sunny, with a high near 93. South wind 5 to 8 mph.
Saturday Night
Clear, with a low around 72. South wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 93. South wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 73. South southeast wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 92. South wind 3 to 6 mph.
Monday Night
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 73. South southeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. South southwest wind around 5 mph becoming calm in the evening.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.7°W
Last Update:
4:32 pm CDT Aug 7, 2025
Forecast Valid:
4pm CDT Aug 7, 2025-6pm CDT Aug 13, 2025
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation