National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

34°F

1°C

Humidity 61%
Wind Speed SW 5 mph
Barometer 29.98 in (1016.0 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 5 Jan 2:56 am CST
Extended Forecast for

4 Miles SSE Dahlgren IL

  • Overnight

    Overnight: Clear, with a low around 28. South southwest wind around 6 mph.

    Low: 28 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 56. Southwest wind 6 to 10 mph.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a steady temperature around 47. South southwest wind 6 to 13 mph, with gusts as high as 23 mph.

    Low: 47 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 61. South southwest wind 7 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 61 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 36. West northwest wind around 5 mph becoming calm in the evening.

    Low: 36 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 59. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 59 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 46. South southeast wind 5 to 8 mph.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers. Cloudy, with a high near 61. South wind 8 to 10 mph.

    High: 61 °F

    Showers

  • Thursday Night

    Thursday Night: Showers. Mostly cloudy, with a low around 54. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Showers

Detailed Forecast

Overnight
Clear, with a low around 28. South southwest wind around 6 mph.
Monday
Sunny, with a high near 56. Southwest wind 6 to 10 mph.
Monday Night
Partly cloudy, with a steady temperature around 47. South southwest wind 6 to 13 mph, with gusts as high as 23 mph.
Tuesday
Mostly sunny, with a high near 61. South southwest wind 7 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 36. West northwest wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 59. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 46. South southeast wind 5 to 8 mph.
Thursday
Showers. Cloudy, with a high near 61. South wind 8 to 10 mph.
Thursday Night
Showers. Mostly cloudy, with a low around 54. South southwest wind around 10 mph, with gusts as high as 20 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 63. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 36. West wind around 10 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny, with a high near 46. West wind 9 to 14 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 25. West northwest wind around 9 mph.
Sunday
Mostly sunny, with a high near 38. West northwest wind 5 to 10 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Dahlgren IL
 38.15°N 88.67°W
Last Update:
1:01 am CST Jan 5, 2026
Forecast Valid:
3am CST Jan 5, 2026-6pm CST Jan 11, 2026
 
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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