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Heavy Rainfall and Flooding in the Mid-Atlantic; Heat and Wildfire Concerns in the West

Slow moving showers and thunderstorms may result in flash flooding for portions of the mid-Atlantic region through tonight. Meanwhile, excessive heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue for the West with dry and breezy conditions. Watching the tropics across the Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fog/Mist

72°F

22°C

Humidity 100%
Wind Speed Calm
Barometer 30.04 in (1017.1 mb)
Dewpoint 72°F (22°C)
Visibility 2.00 mi
Last update 15 Jul 5:56 am CDT
Extended Forecast for

Mount Vernon IL

  • Today

    Today: Showers and thunderstorms likely, mainly after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%.

    High: 88 °F

    Chance
    Showers and
    Patchy Fog
    then T-storms
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 72. Light south southeast wind. Chance of precipitation is 60%.

    Low: 72 °F

    T-storms
    Likely then
    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy through mid morning, then becoming sunny, with a high near 92. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 92 °F

    Partly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 74. South southwest wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Partly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. West southwest wind 3 to 7 mph.

    High: 92 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. West southwest wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 88. Light and variable wind.

    High: 88 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 91. Calm wind becoming south 5 to 7 mph in the morning.

    High: 91 °F

    Chance
    T-storms

Detailed Forecast

Today
Showers and thunderstorms likely, mainly after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%.
Tonight
Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 72. Light south southeast wind. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy through mid morning, then becoming sunny, with a high near 92. Calm wind becoming southwest 5 to 7 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 74. South southwest wind around 5 mph becoming calm in the evening.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. West southwest wind 3 to 7 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. West southwest 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 88. Light and variable wind.
Friday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. Calm wind.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 91. Calm wind becoming south 5 to 7 mph in the morning.
Saturday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74. South wind 3 to 6 mph.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. South southwest wind 5 to 8 mph.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 3 to 6 mph.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. South southwest wind 5 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
5:47 am CDT Jul 15, 2025
Forecast Valid:
6am CDT Jul 15, 2025-6pm CDT Jul 21, 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