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.

Overcast

76°F

24°C

Humidity 82%
Wind Speed SE 3 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 4 Aug 9:56 am CDT
Extended Forecast for

Nason IL

  • Today

    Today: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 83. East wind 3 to 5 mph.

    High: 83 °F

    Partly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers after 4am. Partly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. Light east wind. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. Light east southeast wind.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 89. Calm wind.

    High: 89 °F

    Sunny

  • Wednesday Night

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

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Light southeast wind.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 69. Light southeast wind.

    Low: 69 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92. Calm wind becoming south southeast 5 to 7 mph in the morning.

    High: 92 °F

    Sunny

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 83. East wind 3 to 5 mph.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers after 4am. Partly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Tuesday
A slight chance of showers before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. Light east wind. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 68. Light east southeast wind.
Wednesday
Sunny, with a high near 89. Calm wind.
Wednesday Night
Mostly clear, with a low around 68. Calm wind.
Thursday
Sunny, with a high near 91. Light southeast wind.
Thursday Night
Mostly clear, with a low around 69. Light southeast wind.
Friday
Sunny, with a high near 92. Calm wind becoming south southeast 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 72. Southeast wind 3 to 6 mph.
Saturday
Sunny, with a high near 92. South wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 73. Southeast wind 3 to 6 mph.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. South southwest wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nason IL
 38.18°N 88.98°W
Last Update:
9:24 am CDT Aug 4, 2025
Forecast Valid:
10am CDT Aug 4, 2025-6pm CDT Aug 10, 2025
 
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