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

75°F

24°C

Humidity 96%
Wind Speed SW 3 mph
Barometer 30.03 in (1016.9 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Last update 18 Jul 12:56 am CDT
Extended Forecast for

Sesser IL

Heat Advisory July 18, 12:00pm until July 21, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Mostly clear, with a low around 74. Light west southwest wind.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: A 10 percent chance of showers and thunderstorms after 5pm. Sunny, with a high near 93. Light west wind increasing to 5 to 10 mph in the morning.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 74. West southwest wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly before 4pm. Mostly sunny, with a high near 90. Calm wind. Chance of precipitation is 60%.

    High: 90 °F

    Sunny then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Calm wind.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. Calm wind becoming southwest around 6 mph after midnight.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 95. Southwest wind 6 to 11 mph becoming west northwest in the afternoon.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. North wind 6 to 9 mph.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 74. Light west southwest wind.
Saturday
A 10 percent chance of showers and thunderstorms after 5pm. Sunny, with a high near 93. Light west wind increasing to 5 to 10 mph in the morning.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 74. West southwest wind around 5 mph becoming calm in the evening.
Sunday
Showers and thunderstorms likely, mainly before 4pm. Mostly sunny, with a high near 90. Calm wind. Chance of precipitation is 60%.
Sunday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 30%.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Calm wind.
Monday Night
Mostly clear, with a low around 76. Calm wind becoming southwest around 6 mph after midnight.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 95. Southwest wind 6 to 11 mph becoming west northwest in the afternoon.
Tuesday Night
Mostly clear, with a low around 69. North wind 6 to 9 mph.
Wednesday
Sunny, with a high near 85. North wind 7 to 10 mph.
Wednesday Night
Mostly clear, with a low around 62. North wind 5 to 8 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 82. Calm wind becoming east around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 65. Light east wind.
Friday
A slight chance of showers. Mostly sunny, with a high near 85. Calm wind becoming southeast around 6 mph in the afternoon.
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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:
1:26 am CDT Jul 18, 2026
Forecast Valid:
1am CDT Jul 18, 2026-6pm CDT Jul 24, 2026
 
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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