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.

Fog/Mist

31°F

-1°C

Humidity 96%
Wind Speed Calm
Barometer 29.92 in (1013.7 mb)
Dewpoint 30°F (-1°C)
Visibility 4.00 mi
Last update 7 Jan 2:56 am CST
Extended Forecast for

Dahlgren IL

  • Overnight

    Overnight: Mostly clear, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 57. Calm wind becoming south around 5 mph.

    High: 57 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 42. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers likely, mainly after noon. Cloudy, with a high near 66. South southeast wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 60%.

    High: 66 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 3am, then showers likely. Low around 56. South southwest wind 11 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.

    Low: 56 °F

    Showers then
    Showers
    Likely

  • Friday

    Friday: A 20 percent chance of showers. Partly sunny, with a high near 64. South southwest wind 6 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 64 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 44. North northeast wind 5 to 8 mph.

    Low: 44 °F

    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers before noon. Partly sunny, with a high near 49. West wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 49 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 26. West northwest wind around 11 mph, with gusts as high as 21 mph.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 34. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 57. Calm wind becoming south around 5 mph.
Wednesday Night
Mostly cloudy, with a low around 42. Calm wind becoming south southeast around 6 mph after midnight.
Thursday
Showers likely, mainly after noon. Cloudy, with a high near 66. South southeast wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 60%.
Thursday Night
Showers and possibly a thunderstorm before 3am, then showers likely. Low around 56. South southwest wind 11 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 64. South southwest wind 6 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 44. North northeast wind 5 to 8 mph.
Saturday
A slight chance of showers before noon. Partly sunny, with a high near 49. West wind 9 to 14 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 26. West northwest wind around 11 mph, with gusts as high as 21 mph.
Sunday
Mostly sunny, with a high near 35. West northwest wind 7 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 22. West northwest wind around 6 mph becoming calm.
Monday
Sunny, with a high near 44. South southwest wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 29. Southwest wind around 6 mph.
Tuesday
Mostly sunny, with a high near 50. Southwest wind 6 to 10 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:
3:16 am CST Jan 7, 2026
Forecast Valid:
3am CST Jan 7, 2026-6pm CST Jan 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation