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.

Thunderstorm in Vicinity Light Rain

73°F

23°C

Humidity 96%
Wind Speed Vrbl 3 mph
Barometer 29.92 in (1013.4 mb)
Dewpoint 72°F (22°C)
Visibility 7.00 mi
Last update 27 Jun 2:56 pm CDT
Extended Forecast for

Sesser IL

Extreme Heat Watch June 29, 11:00am until July 2, 08:00pm
Flood Watch June 27, 03:19pm until June 28, 07:00am
Heat Advisory June 28, 12:00pm until June 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Watch
Flood Watch
Heat Advisory
  •  
    Flood Watch June 27, 03:19pm until June 28, 07:00am

    NOW until 7:00am Sun

    Flood Watch

  • This Afternoon

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72. South southwest wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly cloudy through mid morning, then gradual clearing, with a high near 92. Heat index values as high as 106. Light south wind becoming south southwest 5 to 9 mph in the morning.

    High: 92 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South wind 3 to 8 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 94. South wind 5 to 10 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind 3 to 8 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. South wind 3 to 6 mph.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75. South wind around 5 mph becoming calm in the evening.

    Low: 75 °F

    Clear

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Partly sunny, with a steady temperature around 81. Southwest wind around 8 mph.
Tonight
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72. South southwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly cloudy through mid morning, then gradual clearing, with a high near 92. Heat index values as high as 106. Light south wind becoming south southwest 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 74. South wind 3 to 8 mph.
Monday
Sunny, with a high near 94. South wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75. South wind 3 to 8 mph.
Tuesday
Sunny, with a high near 96. South wind 3 to 6 mph.
Tuesday Night
Clear, with a low around 75. South wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 95. Light south wind.
Wednesday Night
Mostly clear, with a low around 76. Light and variable wind.
Thursday
Sunny, with a high near 94. Light south wind.
Thursday Night
Mostly clear, with a low around 76. Calm wind.
Friday
A slight chance of showers and thunderstorms. Sunny, with a high near 93. Calm wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sesser IL
 38.09°N 89.04°W
Last Update:
2:01 pm CDT Jun 27, 2026
Forecast Valid:
3pm CDT Jun 27, 2026-6pm CDT Jul 3, 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