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

66°F

19°C

Humidity 90%
Wind Speed Vrbl 5 mph
Barometer 29.95 in (1014.2 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 22 Jul 5:56 am CDT
Extended Forecast for

Waltonville IL

  • Today

    Today: Mostly sunny, with a high near 83. North northeast wind 3 to 8 mph.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 62. North northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 62 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 81. Calm wind becoming east northeast around 6 mph in the morning.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 62. Light east northeast wind.

    Low: 62 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 80. Calm wind. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Light south southwest wind.

    High: 96 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 83. North northeast wind 3 to 8 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 62. North northeast wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny, with a high near 81. Calm wind becoming east northeast around 6 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 62. Light east northeast wind.
Friday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 80. Calm wind. Chance of precipitation is 30%.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. Light and variable wind.
Saturday Night
Mostly clear, with a low around 72. Calm wind.
Sunday
Sunny, with a high near 96. Light south southwest wind.
Sunday Night
Mostly clear, with a low around 75. Light south southwest wind.
Monday
Mostly sunny and hot, with a high near 97. Southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 74. Southwest wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 93. West northwest wind 5 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Waltonville IL
 38.23°N 89.03°W
Last Update:
4:56 am CDT Jul 22, 2026
Forecast Valid:
6am CDT Jul 22, 2026-6pm CDT Jul 28, 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