National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Thunderstorms and Heavy Rains Across Portions of the Central and Eastern US; Heat Expands to Portions of the East

Widespread showers and thunderstorms, some severe, may produce heavy downpours and flash flooding across much of the eastern and central U.S. Dangerous heat will continue in the Pacific Northwest and expand across portions of the East. Deep tropical moisture and associated thunderstorms will bring heavy rainfall and localized flash flooding across portions of Florida into the central Gulf Coast. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fog/Mist

76°F

24°C

Humidity 100%
Wind Speed SW 6 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 76°F (24°C)
Visibility 6.00 mi
Heat Index75°F (24°C)
Last update 15 Jul 9:56 pm CDT
Extended Forecast for

Waltonville IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 1am and 4am. Mostly cloudy, with a low around 73. Calm wind.

    Low: 73 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 105. Light south southwest wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 20%.

    High: 93 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.

    Low: 75 °F

    Partly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. West southwest wind 5 to 8 mph.

    High: 93 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 72. North wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 86. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 86 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 72. Light and variable wind.

    Low: 72 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90. Southwest wind 3 to 7 mph.

    High: 90 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly between 1am and 4am. Mostly cloudy, with a low around 73. Calm wind.
Wednesday
A slight chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 105. Light south southwest wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. West southwest wind 5 to 8 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 72. North wind around 5 mph becoming calm in the evening.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 86. Calm wind becoming north northeast around 5 mph in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 72. Light and variable wind.
Saturday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90. Southwest wind 3 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 75. South wind 3 to 5 mph.
Sunday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Southwest wind 3 to 6 mph.
Sunday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 74. South wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 91. South wind 3 to 7 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South southeast wind around 6 mph.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 94. South wind 5 to 8 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:
9:32 pm CDT Jul 15, 2025
Forecast Valid:
10pm CDT Jul 15, 2025-6pm CDT Jul 22, 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