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

79°F

26°C

Humidity 72%
Wind Speed Calm
Barometer 30.16 in (1021.2 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 5 Aug 6:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Thursday

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

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92. Calm wind becoming south around 5 mph in the afternoon.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 71. South southeast wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 92. South wind 3 to 7 mph.

    High: 92 °F

    Sunny

  • Saturday Night

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

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 67. Calm wind.
Wednesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Calm wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
Sunny, with a high near 90. Calm wind.
Thursday Night
Mostly clear, with a low around 69. Calm wind.
Friday
Sunny, with a high near 92. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 71. South southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 92. South wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 72. South southeast wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 92. South wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 72. South southeast wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers and thunderstorms. Sunny, with a high near 92. South southwest wind 3 to 6 mph.
Monday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 74. South wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. South 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:
5:47 pm CDT Aug 5, 2025
Forecast Valid:
7pm CDT Aug 5, 2025-6pm CDT Aug 12, 2025
 
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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