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

56°F

13°C

Humidity 100%
Wind Speed SW 5 mph
Barometer 30.08 in (1018.9 mb)
Dewpoint 56°F (13°C)
Visibility 0.25 mi
Last update 24 Dec 10:56 pm CST
Extended Forecast for

9 Miles WSW Johnsonville IL

  • Tonight

    Tonight: A slight chance of drizzle after 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 57. West southwest wind 5 to 7 mph.

    Low: 57 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Christmas Day

    Christmas Day: A slight chance of drizzle before 4pm. Patchy fog between 11am and noon. Otherwise, mostly cloudy, with a high near 66. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 66 °F

    Slight Chance
    Drizzle and
    Patchy Fog

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 58. Calm wind becoming south southwest 5 to 7 mph after midnight.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 71. South southwest wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph.

    High: 71 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 46. Light and variable wind.

    Low: 46 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 55. South southeast wind 6 to 8 mph becoming southwest after midnight.

    Low: 55 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after noon. Cloudy, with a high near 65. Southwest wind 7 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 65 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of rain and snow showers before midnight. Mostly cloudy, with a low around 21. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.

    Low: 21 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

Detailed Forecast

Tonight
A slight chance of drizzle after 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 57. West southwest wind 5 to 7 mph.
Christmas Day
A slight chance of drizzle before 4pm. Patchy fog between 11am and noon. Otherwise, mostly cloudy, with a high near 66. Calm wind becoming east northeast around 5 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 58. Calm wind becoming south southwest 5 to 7 mph after midnight.
Friday
Mostly sunny, with a high near 71. South southwest wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph.
Friday Night
Partly cloudy, with a low around 46. Light and variable wind.
Saturday
Partly sunny, with a high near 65. Calm wind becoming southeast 5 to 7 mph in the morning.
Saturday Night
Mostly cloudy, with a low around 55. South southeast wind 6 to 8 mph becoming southwest after midnight.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Cloudy, with a high near 65. Southwest wind 7 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
A chance of rain and snow showers before midnight. Mostly cloudy, with a low around 21. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.
Monday
Mostly sunny, with a high near 29. Northwest wind 10 to 16 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 18. Northwest wind 5 to 8 mph.
Tuesday
Mostly sunny, with a high near 33. West wind 5 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 22. Southwest wind 5 to 8 mph.
Wednesday
Mostly sunny, with a high near 39. West wind 8 to 10 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WSW Johnsonville IL
 38.48°N 88.68°W
Last Update:
10:42 pm CST Dec 24, 2025
Forecast Valid:
11pm CST Dec 24, 2025-6pm CST Dec 31, 2025
 
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