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.

Fair

55°F

13°C

Humidity 96%
Wind Speed Calm
Barometer 30.03 in (1017.1 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 15 Jun 5:56 am CDT
Extended Forecast for

Waltonville IL

  • Today

    Today: Sunny, with a high near 78. Calm wind becoming northwest around 5 mph.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 82. Light south southwest wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 18 mph.

    High: 82 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 60. Southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 60 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. Breezy, with a light south wind becoming south southwest 20 to 25 mph in the morning. Winds could gust as high as 34 mph.

    High: 88 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 72. Breezy, with a southwest wind 20 to 25 mph decreasing to 14 to 19 mph after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 80%.

    Low: 72 °F

    Showers and
    Breezy

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. West southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers, mainly before 1am. Partly cloudy, with a low around 61. Northwest wind around 6 mph becoming calm in the evening.

    Low: 61 °F

    Chance
    Showers

  • Juneteenth

    Juneteenth: Sunny, with a high near 82. Calm wind becoming north northwest 5 to 8 mph in the morning.

    High: 82 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 78. Calm wind becoming northwest around 5 mph.
Tonight
Mostly clear, with a low around 57. Calm wind.
Tuesday
A 40 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 82. Light south southwest wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 18 mph.
Tuesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 60. Southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 88. Breezy, with a light south wind becoming south southwest 20 to 25 mph in the morning. Winds could gust as high as 34 mph.
Wednesday Night
Showers and possibly a thunderstorm. Low around 72. Breezy, with a southwest wind 20 to 25 mph decreasing to 14 to 19 mph after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 80%.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. West southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Thursday Night
A chance of showers, mainly before 1am. Partly cloudy, with a low around 61. Northwest wind around 6 mph becoming calm in the evening.
Juneteenth
Sunny, with a high near 82. Calm wind becoming north northwest 5 to 8 mph in the morning.
Friday Night
Clear, with a low around 61. Light north wind.
Saturday
Sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. Light south wind.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Light south wind increasing to 5 to 10 mph in the morning.
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ABOUT THIS FORECAST

 
Point Forecast:
Waltonville IL
 38.23°N 89.03°W
Last Update:
5:16 am CDT Jun 15, 2026
Forecast Valid:
6am CDT Jun 15, 2026-6pm CDT Jun 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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