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Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Overcast

64°F

18°C

Humidity 87%
Wind Speed SW 10 mph
Barometer 29.91 in (1012.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 9 Mar 11:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 61. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 61 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 78. South southwest wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Cloudy, with a low around 65. South southwest wind 16 to 18 mph, with gusts as high as 29 mph.

    Low: 65 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 4pm, then showers likely. High near 70. Breezy, with a south southwest wind 17 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%.

    High: 70 °F

    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers likely, mainly before 7pm. Mostly cloudy, with a low around 34. North northwest wind 10 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    Low: 34 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 52. North northwest wind around 6 mph becoming west southwest in the afternoon.

    High: 52 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 41. South wind 5 to 10 mph increasing to 12 to 17 mph after midnight. Winds could gust as high as 28 mph.

    Low: 41 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 64. Southwest wind 10 to 16 mph, with gusts as high as 28 mph.

    High: 64 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 40. Northwest wind around 6 mph becoming east after midnight.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 61. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Tuesday
Mostly cloudy, with a high near 78. South southwest wind 9 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Cloudy, with a low around 65. South southwest wind 16 to 18 mph, with gusts as high as 29 mph.
Wednesday
Showers and possibly a thunderstorm before 4pm, then showers likely. High near 70. Breezy, with a south southwest wind 17 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%.
Wednesday Night
Showers likely, mainly before 7pm. Mostly cloudy, with a low around 34. North northwest wind 10 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Thursday
Sunny, with a high near 52. North northwest wind around 6 mph becoming west southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 41. South wind 5 to 10 mph increasing to 12 to 17 mph after midnight. Winds could gust as high as 28 mph.
Friday
Mostly cloudy, with a high near 64. Southwest wind 10 to 16 mph, with gusts as high as 28 mph.
Friday Night
Mostly cloudy, with a low around 40. Northwest wind around 6 mph becoming east after midnight.
Saturday
Mostly sunny, with a high near 68. East wind 7 to 13 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Mostly clear, with a low around 52. South southwest wind 10 to 14 mph, with gusts as high as 25 mph.
Sunday
A chance of showers. Partly sunny, with a high near 66. Breezy, with a south southwest wind 15 to 20 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.
Sunday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 30. North northwest wind 14 to 17 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 42. North northwest wind 10 to 13 mph, with gusts as high as 21 mph.
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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:
11:31 pm CDT Mar 9, 2026
Forecast Valid:
12am CDT Mar 10, 2026-6pm CDT Mar 16, 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