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.

Overcast

73°F

23°C

Humidity 81%
Wind Speed W 10 mph
Barometer 29.67 in (1004.8 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 1 Aug 3:56 pm CDT
Extended Forecast for

Dahlgren IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers. Mostly cloudy, with a high near 74. West southwest wind around 9 mph.

    High: 74 °F

    Chance
    Showers

  • Tonight

    Tonight: A 40 percent chance of showers. Mostly cloudy, with a low around 65. West wind around 5 mph becoming calm.

    Low: 65 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. North wind 8 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64. North wind 5 to 11 mph.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83. North northeast wind 5 to 7 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. Light north northeast wind.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85. Calm wind.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Calm wind.

    High: 87 °F

    Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers. Mostly cloudy, with a high near 74. West southwest wind around 9 mph.
Tonight
A 40 percent chance of showers. Mostly cloudy, with a low around 65. West wind around 5 mph becoming calm.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. North wind 8 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Sunday Night
Partly cloudy, with a low around 64. North wind 5 to 11 mph.
Monday
Mostly sunny, with a high near 83. North northeast wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 64. Light north northeast wind.
Tuesday
Sunny, with a high near 85. Calm wind.
Tuesday Night
Mostly clear, with a low around 65. Calm wind.
Wednesday
Sunny, with a high near 87. Calm wind.
Wednesday Night
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 68. Calm wind.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind 3 to 5 mph.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 3 to 7 mph.
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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:
3:16 pm CDT Aug 1, 2026
Forecast Valid:
4pm CDT Aug 1, 2026-6pm CDT Aug 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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