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

48°F

9°C

Humidity 80%
Wind Speed NW 6 mph
Barometer 30.02 in (1017.1 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 7 Mar 6:56 pm CST
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. West northwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 24 mph.

    Low: 40 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 64. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 64 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44. South southwest wind 5 to 7 mph.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73. South southwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after midnight. Partly cloudy, with a low around 61. South southwest wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 61 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 78. South southwest wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    High: 78 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 62. Breezy, with a south southwest wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.

    Low: 62 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Cloudy, with a high near 72. South southwest wind around 18 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.

    High: 72 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers before midnight. Partly cloudy, with a low around 33. Northwest wind 16 to 18 mph, with gusts as high as 24 mph.

    Low: 33 °F

    Chance
    Showers then
    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 40. West northwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 24 mph.
Sunday
Sunny, with a high near 64. Calm wind becoming southwest 5 to 7 mph in the morning.
Sunday Night
Clear, with a low around 44. South southwest wind 5 to 7 mph.
Monday
Sunny, with a high near 73. South southwest wind 7 to 15 mph, with gusts as high as 23 mph.
Monday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 61. South southwest wind 9 to 11 mph, with gusts as high as 21 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 78. South southwest wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 62. Breezy, with a south southwest wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm. Cloudy, with a high near 72. South southwest wind around 18 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.
Wednesday Night
A chance of showers before midnight. Partly cloudy, with a low around 33. Northwest wind 16 to 18 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 54. Northwest wind 5 to 15 mph, with gusts as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 40. Light west southwest wind becoming south 9 to 14 mph in the evening. Winds could gust as high as 24 mph.
Friday
Partly sunny, with a high near 65. Breezy, with a southwest wind 14 to 20 mph, with gusts as high as 26 mph.
Friday Night
Mostly cloudy, with a low around 40. Southwest wind 8 to 11 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.
Saturday
Mostly cloudy, with a high near 59. North northeast wind 8 to 11 mph becoming east southeast in the afternoon. Winds could gust as high as 18 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.67°W
Last Update:
4:46 pm CST Mar 7, 2026
Forecast Valid:
7pm CST Mar 7, 2026-6pm CDT Mar 14, 2026
 
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Additional Resources

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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