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

69°F

21°C

Humidity 66%
Wind Speed NE 6 mph
Barometer 30.05 in (1017.4 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 7 Sep 12:56 am CDT
Extended Forecast for

Waltonville IL

  • Overnight

    Overnight: Mostly clear, with a low around 64. Northeast wind around 6 mph.

    Low: 64 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 91. East northeast wind 5 to 7 mph.

    High: 91 °F

    Sunny

  • Monday Night

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

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97. Calm wind becoming south around 5 mph in the afternoon.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 100. Southwest wind 9 to 14 mph, with gusts as high as 20 mph.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 70. West southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 87. Calm wind becoming northwest 5 to 7 mph in the morning.

    High: 87 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A slight chance of showers before 1am. Partly cloudy, with a low around 62. Light northeast wind.

    Low: 62 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 64. Northeast wind around 6 mph.
Labor Day
Sunny, with a high near 91. East northeast wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 64. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny and hot, with a high near 97. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 72. Calm wind becoming south 5 to 7 mph after midnight.
Wednesday
Sunny and hot, with a high near 100. Southwest wind 9 to 14 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 70. West southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 87. Calm wind becoming northwest 5 to 7 mph in the morning.
Thursday Night
A slight chance of showers before 1am. Partly cloudy, with a low around 62. Light northeast wind.
Friday
Sunny, with a high near 88. Light and variable wind.
Friday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 64. Calm wind.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind becoming south southwest 5 to 8 mph in the morning.
Saturday Night
A slight chance of showers. Mostly clear, with a low around 67. South wind 3 to 5 mph.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Waltonville IL
 38.2°N 89.03°W
Last Update:
9:06 pm CDT Sep 6, 2026
Forecast Valid:
1am CDT Sep 7, 2026-6pm CDT Sep 13, 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