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.

Fog/Mist

54°F

12°C

Humidity 100%
Wind Speed SE 6 mph
Barometer 30.19 in (1022.5 mb)
Dewpoint 54°F (12°C)
Visibility 6.00 mi
Wind Chill52°F (11°C)
Last update 2 Nov 2:56 am CST
Extended Forecast for

Dahlgren IL

  • Overnight

    Overnight: A chance of drizzle, mainly after 4am. Cloudy, with a low around 53. Southeast wind 3 to 7 mph.

    Low: 53 °F

    Chance
    Drizzle

  • Monday

    Monday: A slight chance of drizzle before 10am. Cloudy, with a high near 69. South wind 7 to 14 mph, with gusts as high as 20 mph.

    High: 69 °F

    Slight Chance
    Drizzle then
    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 60. South southeast wind 11 to 17 mph, with gusts as high as 26 mph.

    Low: 60 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers after 4pm. Mostly cloudy, with a high near 78. Breezy, with a south wind 17 to 24 mph, with gusts as high as 31 mph.

    High: 78 °F

    Breezy.
    Mostly Cloudy
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers before 9pm, then showers and possibly a thunderstorm between 9pm and midnight, then showers after midnight. Low around 57. South wind 7 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.

    Low: 57 °F

    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers before noon. Mostly sunny, with a high near 70. West southwest wind 6 to 13 mph.

    High: 70 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 46. Light southwest wind.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69. Light west southwest wind increasing to 6 to 11 mph in the morning.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of drizzle, mainly after 4am. Cloudy, with a low around 53. Southeast wind 3 to 7 mph.
Monday
A slight chance of drizzle before 10am. Cloudy, with a high near 69. South wind 7 to 14 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 60. South southeast wind 11 to 17 mph, with gusts as high as 26 mph.
Tuesday
A 40 percent chance of showers after 4pm. Mostly cloudy, with a high near 78. Breezy, with a south wind 17 to 24 mph, with gusts as high as 31 mph.
Tuesday Night
Showers before 9pm, then showers and possibly a thunderstorm between 9pm and midnight, then showers after midnight. Low around 57. South wind 7 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.
Wednesday
A 20 percent chance of showers before noon. Mostly sunny, with a high near 70. West southwest wind 6 to 13 mph.
Wednesday Night
Mostly clear, with a low around 46. Light southwest wind.
Thursday
Sunny, with a high near 69. Light west southwest wind increasing to 6 to 11 mph in the morning.
Thursday Night
Partly cloudy, with a low around 45. Calm wind.
Friday
Mostly sunny, with a high near 63. Light northwest wind increasing to 5 to 10 mph in the morning.
Friday Night
Partly cloudy, with a low around 40. Light north northwest wind.
Saturday
Mostly sunny, with a high near 62. Calm wind becoming north northwest around 5 mph.
Saturday Night
Partly cloudy, with a low around 39. Calm wind.
Sunday
Mostly sunny, with a high near 64. Light and variable wind becoming northwest 5 to 10 mph in the morning.
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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:
2:21 am CST Nov 2, 2026
Forecast Valid:
3am CST Nov 2, 2026-6pm CST Nov 8, 2026
 
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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