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

71°F

22°C

Humidity 59%
Wind Speed S 13 mph
Barometer 29.97 in
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 30 Mar 8:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: Partly cloudy, with a low around 63. South southwest wind around 15 mph, with gusts as high as 26 mph.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 29 mph.

    High: 82 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 63. South southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 63 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely. Mostly cloudy, with a high near 79. South southwest wind 8 to 11 mph. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 65. South southeast wind 8 to 14 mph, with gusts as high as 23 mph.

    Low: 65 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Breezy, with a south wind 15 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.

    High: 80 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 62. South southwest wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.

    Low: 62 °F

    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. South southwest wind 11 to 15 mph, with gusts as high as 21 mph.

    High: 78 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. South wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 63. South southwest wind around 15 mph, with gusts as high as 26 mph.
Tuesday
Mostly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 29 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 63. South southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday
Showers likely. Mostly cloudy, with a high near 79. South southwest wind 8 to 11 mph. Chance of precipitation is 70%.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 65. South southeast wind 8 to 14 mph, with gusts as high as 23 mph.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Breezy, with a south wind 15 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.
Thursday Night
Showers and possibly a thunderstorm. Low around 62. South southwest wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. South southwest wind 11 to 15 mph, with gusts as high as 21 mph.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. South wind 11 to 13 mph, with gusts as high as 21 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. South wind 14 to 17 mph, with gusts as high as 23 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 42. West northwest wind around 14 mph, with gusts as high as 22 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 59. West northwest wind around 15 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 37. North wind 7 to 10 mph.
Monday
Sunny, with a high near 62. North wind 7 to 9 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:
7:21 pm CDT Mar 30, 2026
Forecast Valid:
9pm CDT Mar 30, 2026-6pm CDT Apr 6, 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