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.

63°F

17°C

Humidity 76%
Wind Speed Calm
Barometer 29.81 in (1009.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 21 Mar 9:56 pm CDT
Extended Forecast for

Waltonville IL

  • Tonight

    Tonight: Mostly clear, with a low around 62. Light west southwest wind becoming south southwest 5 to 9 mph after midnight. Winds could gust as high as 18 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 84. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. North wind 13 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    Low: 38 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 57. North northeast wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40. Northeast wind around 6 mph.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 63. Southeast wind around 6 mph.

    High: 63 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 44. Light east southeast wind.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 71. South wind 5 to 9 mph.

    High: 71 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 55. South wind 6 to 8 mph.

    Low: 55 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 62. Light west southwest wind becoming south southwest 5 to 9 mph after midnight. Winds could gust as high as 18 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 84. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday Night
A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. North wind 13 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 57. North northeast wind 8 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly cloudy, with a low around 40. Northeast wind around 6 mph.
Tuesday
Partly sunny, with a high near 63. Southeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 44. Light east southeast wind.
Wednesday
Partly sunny, with a high near 71. South wind 5 to 9 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 55. South wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 82. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 46. South southwest wind 11 to 13 mph becoming north northeast after midnight. Winds could gust as high as 22 mph.
Friday
A chance of showers. Partly sunny, with a high near 57. North northeast wind 11 to 13 mph, with gusts as high as 21 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 37. North northeast wind 8 to 10 mph.
Saturday
A slight chance of showers. Partly sunny, with a high near 57. Northeast wind 7 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:
8:41 pm CDT Mar 21, 2026
Forecast Valid:
10pm CDT Mar 21, 2026-6pm CDT Mar 28, 2026
 
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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