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.

Partly Cloudy with Haze

76°F

24°C

Humidity 82%
Wind Speed E 3 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 70°F (21°C)
Visibility 6.00 mi
Heat Index77°F (25°C)
Last update 20 Jul 7:56 am CDT
Extended Forecast for

Mount Vernon IL

Heat Advisory July 20, 08:30am until July 21, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 20, 08:30am until July 21, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Today

    High: 92 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 76. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 96. Heat index values as high as 109. Southwest wind 5 to 9 mph becoming west northwest in the afternoon.

    High: 96 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. North wind 3 to 8 mph.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 83. North wind 6 to 9 mph.

    High: 83 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61. North northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 63. Light northeast wind.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 92. Calm wind.
Tonight
Mostly clear, with a low around 76. Calm wind becoming south southwest around 5 mph after midnight.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 96. Heat index values as high as 109. Southwest wind 5 to 9 mph becoming west northwest in the afternoon.
Tuesday Night
Mostly clear, with a low around 69. North wind 3 to 8 mph.
Wednesday
Sunny, with a high near 83. North wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 61. North northeast wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 82. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 63. Light northeast wind.
Friday
A slight chance of showers. Partly sunny, with a high near 81. Light east wind.
Friday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 65. Light and variable wind.
Saturday
A slight chance of showers. Mostly sunny, with a high near 87. Calm wind becoming east southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 69. Light and variable wind.
Sunday
Mostly sunny, with a high near 91. Calm wind becoming south around 5 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
4:31 am CDT Jul 20, 2026
Forecast Valid:
8am CDT Jul 20, 2026-6pm CDT Jul 26, 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