National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Light Rain

71°F

22°C

Humidity 100%
Wind Speed SW 10 mph
Barometer 30.00 in (1015.8 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 19 Aug 8:56 am CDT
Extended Forecast for

4 Miles SW Nason IL

  • Today

    Today: Showers and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms, mainly between 11am and 1pm. High near 83. West southwest wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 80%.

    High: 83 °F

    Showers then
    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 3am. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 60%.

    Low: 69 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86. Calm wind becoming northwest 5 to 7 mph in the afternoon.

    High: 86 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 67. Light north wind.

    Low: 67 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms, mainly between 11am and 1pm. High near 83. West southwest wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms likely, mainly before 3am. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 60%.
Thursday
Mostly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 68. Calm wind.
Friday
Sunny, with a high near 86. Calm wind.
Friday Night
Mostly clear, with a low around 68. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 67. Light north wind.
Sunday
Mostly sunny, with a high near 84. Calm wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 66. East wind 3 to 5 mph.
Monday
Mostly sunny, with a high near 84. East southeast wind 3 to 5 mph.
Monday Night
Mostly clear, with a low around 68. East wind around 5 mph.
Tuesday
Sunny, with a high near 87. East wind around 6 mph.
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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:
7:01 am CDT Aug 19, 2026
Forecast Valid:
9am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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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