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

88°F

31°C

Humidity 66%
Wind Speed Calm
Barometer 29.94 in (1013.7 mb)
Dewpoint 75°F (24°C)
Visibility 9.00 mi
Heat Index98°F (37°C)
Last update 19 Aug 5:56 pm CDT
Extended Forecast for

Waltonville IL

Heat Advisory August 19, 06:06pm until August 19, 07:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory August 19, 06:06pm until August 19, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Tonight

    Low: 71 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90. North northeast wind 6 to 11 mph.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66. North northeast wind 5 to 9 mph.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87. North northeast wind 6 to 10 mph.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. Northeast wind 5 to 8 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90. Calm wind becoming north northeast around 6 mph in the morning.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. North northeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 90. Calm wind becoming north northwest 5 to 8 mph in the afternoon.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 71. North northwest wind 5 to 7 mph becoming calm.
Wednesday
Mostly sunny, with a high near 90. North northeast wind 6 to 11 mph.
Wednesday Night
Mostly clear, with a low around 66. North northeast wind 5 to 9 mph.
Thursday
Sunny, with a high near 87. North northeast wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 65. Northeast wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 90. Calm wind becoming north northeast around 6 mph in the morning.
Friday Night
Mostly clear, with a low around 64. North northeast wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 90. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 62. North northwest wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 84. Light north northwest wind increasing to 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 57. North northwest wind 5 to 8 mph becoming calm in the evening.
Monday
Sunny, with a high near 81. Calm wind becoming northwest 5 to 9 mph in the morning.
Monday Night
Partly cloudy, with a low around 55. North northwest wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 81. Calm wind becoming north northwest 5 to 7 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waltonville IL
 38.2°N 89.03°W
Last Update:
6:01 pm CDT Aug 19, 2025
Forecast Valid:
6pm CDT Aug 19, 2025-6pm CDT Aug 26, 2025
 
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