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.

Fair

100°F

38°C

Humidity 34%
Wind Speed S 10 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index105°F (41°C)
Last update 1 Sep 2:56 pm CDT
Extended Forecast for

3 Miles ESE Sesser IL

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

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • This Afternoon

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 77. South wind 3 to 5 mph.

    Low: 77 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. South southwest wind 3 to 8 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 78. South southwest wind around 6 mph becoming calm after midnight.

    Low: 78 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 78. South wind around 5 mph becoming calm in the evening.

    Low: 78 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 99. Light west southwest wind.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 77. Calm wind.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 95. Light south wind.
Tonight
Clear, with a low around 77. South wind 3 to 5 mph.
Wednesday
Sunny and hot, with a high near 99. South southwest wind 3 to 8 mph.
Wednesday Night
Clear, with a low around 78. South southwest wind around 6 mph becoming calm after midnight.
Thursday
Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Thursday Night
Clear, with a low around 78. South wind around 5 mph becoming calm in the evening.
Friday
Sunny and hot, with a high near 99. Light west southwest wind.
Friday Night
Mostly clear, with a low around 77. Calm wind.
Saturday
A slight chance of showers and thunderstorms. Sunny and hot, with a high near 98. Light and variable wind.
Saturday Night
Partly cloudy, with a low around 75. Calm wind.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 94. Calm wind becoming north around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 73. East wind 3 to 5 mph.
Labor Day
Sunny, with a high near 92. East wind 3 to 6 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Sesser IL
 38.07°N 88.99°W
Last Update:
1:26 pm CDT Sep 1, 2026
Forecast Valid:
3pm CDT Sep 1, 2026-6pm CDT Sep 7, 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