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.

A Few Clouds

63°F

17°C

Humidity 97%
Wind Speed SW 9 mph
Barometer 29.91 in (1012.8 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 10 Mar 3:56 am CDT
Extended Forecast for

Dahlgren IL

  • Today

    Today: Mostly cloudy, with a high near 79. South southwest wind 8 to 16 mph, with gusts as high as 25 mph.

    High: 79 °F

    Mostly Cloudy

  • Tonight

    Tonight: 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. Temperature rising to near 69 by 11am, then falling to around 52 during the remainder of the day. Breezy, with a southwest wind 17 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 90%.

    High: 69 °F⇓

    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers likely before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 34. Breezy, with a north northwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 60%.

    Low: 34 °F

    Showers
    Likely and
    Breezy then
    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 54. North northwest wind around 6 mph becoming west southwest in the afternoon.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 42. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 30 mph.

    Low: 42 °F

    Partly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 63. Southwest wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 63 °F

    Partly Sunny

  • 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

  • Saturday

    Saturday: Mostly sunny, with a high near 67. East wind 7 to 14 mph becoming south in the afternoon. Winds could gust as high as 21 mph.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 79. South southwest wind 8 to 16 mph, with gusts as high as 25 mph.
Tonight
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. Temperature rising to near 69 by 11am, then falling to around 52 during the remainder of the day. Breezy, with a southwest wind 17 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 90%.
Wednesday Night
Showers likely before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 34. Breezy, with a north northwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 60%.
Thursday
Sunny, with a high near 54. North northwest wind around 6 mph becoming west southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 42. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 30 mph.
Friday
Partly sunny, with a high near 63. Southwest wind 11 to 18 mph, with gusts as high as 29 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 67. East wind 7 to 14 mph becoming south in the afternoon. Winds could gust as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 54. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 66. Breezy, with a south southwest wind 16 to 22 mph becoming west northwest in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 26. Blustery, with a northwest wind 17 to 21 mph, with gusts as high as 29 mph.
Monday
A slight chance of snow showers. Mostly sunny, with a high near 37. Northwest wind 13 to 15 mph, with gusts as high as 22 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:
2:26 am CDT Mar 10, 2026
Forecast Valid:
4am 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