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

65°F

18°C

Humidity 40%
Wind Speed E 5 mph
Barometer 30.26 in (1025.1 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 20 Apr 3:56 pm CDT
Extended Forecast for

3 Miles SSE Dahlgren IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 67. Calm wind.

    High: 67 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 50. Calm wind becoming south 5 to 7 mph in the evening.

    Low: 50 °F

    Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Southwest wind 7 to 17 mph, with gusts as high as 26 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 55. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 76. Southwest wind 7 to 11 mph.

    High: 76 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 6 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81. South wind 6 to 15 mph, with gusts as high as 22 mph.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. Partly sunny, with a high near 77. Southwest wind 13 to 15 mph, with gusts as high as 22 mph.

    High: 77 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 67. Calm wind.
Tonight
Clear, with a low around 50. Calm wind becoming south 5 to 7 mph in the evening.
Tuesday
Mostly sunny, with a high near 77. Southwest wind 7 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly clear, with a low around 55. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 76. Southwest wind 7 to 11 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind around 6 mph.
Thursday
Sunny, with a high near 81. South wind 6 to 15 mph, with gusts as high as 22 mph.
Thursday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind around 11 mph, with gusts as high as 21 mph.
Friday
Showers and possibly a thunderstorm. Partly sunny, with a high near 77. Southwest wind 13 to 15 mph, with gusts as high as 22 mph.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 56. West southwest wind 6 to 8 mph becoming north northwest after midnight.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 75. North wind 6 to 9 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 54. North northeast wind around 6 mph.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 73. Northeast wind 7 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Dahlgren IL
 38.15°N 88.67°W
Last Update:
1:51 pm CDT Apr 20, 2026
Forecast Valid:
4pm CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation