National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

A Few Clouds

79°F

26°C

Humidity 45%
Wind Speed N 6 mph
Barometer 30.16 in (1021.2 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 23 Jun 3:56 pm CDT
Extended Forecast for

Sesser IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 82. Light north northeast wind.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. Calm wind becoming south around 5 mph in the afternoon.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Partly cloudy, with a low around 67. Light south southwest wind. Chance of precipitation is 30%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 87. Light south southwest wind. Chance of precipitation is 50%.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 69. Light south wind. Chance of precipitation is 90%.

    Low: 69 °F

    Showers

  • Friday

    Friday: Showers before 7am, then showers and possibly a thunderstorm between 7am and 1pm, then showers and thunderstorms likely after 1pm. High near 84. Light south southwest wind becoming west southwest 5 to 9 mph in the morning. Chance of precipitation is 90%.

    High: 84 °F

    Showers then
    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. Southwest wind around 6 mph becoming calm in the evening.

    Low: 72 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 89. South southwest wind 3 to 6 mph.

    High: 89 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 82. Light north northeast wind.
Tonight
Partly cloudy, with a low around 62. Calm wind.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming south around 5 mph in the afternoon.
Wednesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Partly cloudy, with a low around 67. Light south southwest wind. Chance of precipitation is 30%.
Thursday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 87. Light south southwest wind. Chance of precipitation is 50%.
Thursday Night
Showers and possibly a thunderstorm. Low around 69. Light south wind. Chance of precipitation is 90%.
Friday
Showers before 7am, then showers and possibly a thunderstorm between 7am and 1pm, then showers and thunderstorms likely after 1pm. High near 84. Light south southwest wind becoming west southwest 5 to 9 mph in the morning. Chance of precipitation is 90%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. Southwest wind around 6 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. South southwest wind 3 to 6 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind around 5 mph.
Sunday
Sunny, with a high near 95. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 6 to 11 mph.
Monday
Sunny and hot, with a high near 97. South southwest wind 6 to 11 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sesser IL
 38.09°N 89.04°W
Last Update:
1:16 pm CDT Jun 23, 2026
Forecast Valid:
4pm CDT Jun 23, 2026-6pm CDT Jun 29, 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