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Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

69°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 30.05 in (1017.3 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 2 Sep 5:56 am CDT
Extended Forecast for

Mount Vernon IL

Extreme Heat Warning September 2, 06:05am until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 2, 06:05am until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Today

    High: 101 °F

    Hot

  • Tonight

    Tonight: Clear, with a low around 76. Light south southwest wind.

    Low: 76 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 100. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 100 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 77. Calm wind.

    Low: 77 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 100. Light and variable wind.

    High: 100 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. Calm wind.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny and hot, with a high near 99. Calm wind.

    High: 99 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny and hot, with a high near 101. Heat index values as high as 105. Calm wind becoming south southwest 5 to 7 mph in the morning.
Tonight
Clear, with a low around 76. Light south southwest wind.
Thursday
Sunny and hot, with a high near 100. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Thursday Night
Clear, with a low around 77. Calm wind.
Friday
Sunny and hot, with a high near 100. Light and variable wind.
Friday Night
Mostly clear, with a low around 76. Calm wind.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny and hot, with a high near 99. Calm wind.
Saturday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Calm wind.
Sunday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 95. Calm wind becoming northeast around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 69. East northeast wind around 5 mph becoming calm in the evening.
Labor Day
Sunny, with a high near 94. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 68. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 95. Calm wind becoming south around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
1:25 am CDT Sep 2, 2026
Forecast Valid:
6am CDT Sep 2, 2026-6pm CDT Sep 8, 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