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.

Fair

93°F

34°C

Humidity 54%
Wind Speed S 9 mph
Barometer 29.95 in (1014.0 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index103°F (39°C)
Last update 26 Jun 5:56 pm CDT
Extended Forecast for

2 Miles NW Waltonville IL

Heat Advisory June 26, 06:58pm until June 27, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 26, 06:58pm until June 27, 07:00pm

    NOW until 7:00pm Fri

    Heat Advisory

  • Tonight

    Low: 75 °F

    Isolated
    T-storms then
    Mostly Clear

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 92. Southwest wind 5 to 10 mph.

    High: 92 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. West wind around 6 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 89. Calm wind becoming west southwest around 6 mph in the morning. Chance of precipitation is 60%.

    High: 89 °F

    Chance
    Showers then
    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely before 10pm, then a slight chance of showers. Mostly cloudy, with a low around 73. Light south southwest wind. Chance of precipitation is 60%.

    Low: 73 °F

    T-storms
    Likely then
    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 50%.

    High: 91 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 73. Light south southwest wind.

    Low: 73 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 89. Calm wind becoming west 5 to 7 mph in the morning.

    High: 89 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 75. West wind around 6 mph becoming light and variable. Chance of precipitation is 20%.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 92. Southwest wind 5 to 10 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. West wind around 6 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 89. Calm wind becoming west southwest around 6 mph in the morning. Chance of precipitation is 60%.
Saturday Night
Showers and thunderstorms likely before 10pm, then a slight chance of showers. Mostly cloudy, with a low around 73. Light south southwest wind. Chance of precipitation is 60%.
Sunday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 50%.
Sunday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 73. Light south southwest wind.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 89. Calm wind becoming west 5 to 7 mph in the morning.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 71. Light northwest wind.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. North wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 67. Light north wind.
Wednesday
Mostly sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 67. Calm wind.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Calm wind becoming south southeast around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Waltonville IL
 38.23°N 89.06°W
Last Update:
5:47 pm CDT Jun 26, 2025
Forecast Valid:
6pm CDT Jun 26, 2025-6pm CDT Jul 3, 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