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.

Fair

74°F

23°C

Humidity 62%
Wind Speed Calm
Barometer 29.84 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 18 Jun 5:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 60. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 60 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 83. Light north northwest wind.

    High: 83 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 86. Light southwest wind.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 85. Light southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%.

    High: 85 °F

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 68. South southwest wind 13 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.

    Low: 68 °F

    Showers

  • Monday

    Monday: A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 80. North northwest wind around 13 mph, with gusts as high as 20 mph.

    High: 80 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. North wind 5 to 9 mph becoming light after midnight.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 60. North northwest wind 5 to 7 mph becoming calm in the evening.
Juneteenth
Mostly sunny, with a high near 83. Light north northwest wind.
Friday Night
Partly cloudy, with a low around 63. Calm wind.
Saturday
Sunny, with a high near 86. Light southwest wind.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66. Calm wind.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 85. Light southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm. Low around 68. South southwest wind 13 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.
Monday
A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 80. North northwest wind around 13 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 61. North wind 5 to 9 mph becoming light after midnight.
Tuesday
Mostly sunny, with a high near 81. Light north wind.
Tuesday Night
Mostly clear, with a low around 62. Calm wind.
Wednesday
Mostly sunny, with a high near 83. Light north wind.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 63. Light west northwest wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Calm wind becoming west 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:
5:46 pm CDT Jun 18, 2026
Forecast Valid:
6pm CDT Jun 18, 2026-6pm CDT Jun 25, 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