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

74°F

23°C

Humidity 67%
Wind Speed NE 3 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 19 Jun 8:56 am CDT
Extended Forecast for

4 Miles SW Nason IL

  • Juneteenth

    Juneteenth: Sunny, with a high near 84. Calm wind.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 87. Light southwest wind.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 69. Light south southeast wind.

    Low: 69 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers likely, then showers and possibly a thunderstorm after 10am. High near 85. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%.

    High: 85 °F

    Showers
    Likely then
    T-storms

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 70. West southwest wind 14 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 70 °F

    T-storms then
    Showers

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 80. West northwest wind around 11 mph, with gusts as high as 18 mph.

    High: 80 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. North wind 5 to 9 mph.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. North northeast wind around 5 mph becoming calm in the morning.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Sunny, with a high near 84. Calm wind.
Tonight
Partly cloudy, with a low around 66. Calm wind.
Saturday
Sunny, with a high near 87. Light southwest wind.
Saturday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 69. Light south southeast wind.
Sunday
Showers likely, then showers and possibly a thunderstorm after 10am. High near 85. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%.
Sunday Night
Showers and possibly a thunderstorm. Low around 70. West southwest wind 14 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Monday
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 80. West northwest wind around 11 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 9 mph.
Tuesday
Mostly sunny, with a high near 81. North northeast wind around 5 mph becoming calm in the morning.
Tuesday Night
Mostly clear, with a low around 64. Light north wind.
Wednesday
Mostly sunny, with a high near 83. Light and variable wind.
Wednesday Night
Mostly clear, with a low around 65. Light and variable wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Light south wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Nason IL
 38.14°N 89.01°W
Last Update:
9:11 am CDT Jun 19, 2026
Forecast Valid:
9am CDT Jun 19, 2026-6pm CDT Jun 25, 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