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.

Thunderstorm in Vicinity

80°F

27°C

Humidity 85%
Wind Speed Calm
Barometer 29.96 in (1014.5 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 19 Aug 6:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 9pm. Partly cloudy, with a low around 71. Calm wind becoming north northeast around 5 mph after midnight. Chance of precipitation is 60%.

    Low: 71 °F

    Showers
    Likely then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. North northeast wind 6 to 11 mph.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 65. North northeast wind 5 to 9 mph.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 85. North northeast wind 6 to 10 mph.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. North northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming north northeast around 6 mph in the morning.

    High: 88 °F

    Sunny

  • Friday Night

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

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 89. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly before 9pm. Partly cloudy, with a low around 71. Calm wind becoming north northeast around 5 mph after midnight. Chance of precipitation is 60%.
Wednesday
Mostly sunny, with a high near 88. North northeast wind 6 to 11 mph.
Wednesday Night
Mostly clear, with a low around 65. North northeast wind 5 to 9 mph.
Thursday
Mostly sunny, with a high near 85. North northeast wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 64. North northeast wind 5 to 7 mph becoming calm in the evening.
Friday
Sunny, with a high near 88. Calm wind becoming north northeast around 6 mph in the morning.
Friday Night
Mostly clear, with a low around 64. Light north northeast wind.
Saturday
Mostly sunny, with a high near 89. Calm wind becoming north northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 62. North northwest wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 83. Light north northwest wind becoming northwest 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 56. North northwest wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 80. Calm wind becoming northwest 5 to 8 mph in the morning.
Monday Night
Partly cloudy, with a low around 54. North northwest wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 79. Calm wind becoming north northwest 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:
7:16 pm CDT Aug 19, 2025
Forecast Valid:
7pm CDT Aug 19, 2025-6pm CDT Aug 26, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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