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

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

77°F

25°C

Humidity 94%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 75°F (24°C)
Visibility 6.00 mi
Heat Index78°F (26°C)
Last update 14 Jul 8:56 pm CDT
Extended Forecast for

9 Miles WSW Johnsonville IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 4am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms and
    Patchy Fog

  • Tuesday

    Tuesday: 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. Patchy fog before 8am. Otherwise, partly sunny, with a high near 88. Calm wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 60%.

    High: 88 °F

    Chance
    T-storms and
    Patchy Fog
    then T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 72. Light south 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 sunny, with a high near 91. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southwest wind 3 to 5 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 40 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

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph.

    High: 88 °F

    Chance
    T-storms

  • Friday Night

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

    Low: 72 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after 4am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 71. Calm wind.
Tuesday
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. Patchy fog before 8am. Otherwise, partly sunny, with a high near 88. Calm wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 60%.
Tuesday Night
Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 72. Light south wind. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming southwest 5 to 7 mph in the morning.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southwest wind 3 to 5 mph.
Thursday
A 40 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 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.
Friday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph.
Friday Night
A slight chance of showers and thunderstorms. 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 southwest around 6 mph in the morning.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light south southwest wind.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind becoming west southwest around 5 mph in the morning.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light south southwest wind.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. South wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WSW Johnsonville IL
 38.48°N 88.68°W
Last Update:
8:32 pm CDT Jul 14, 2025
Forecast Valid:
9pm CDT Jul 14, 2025-6pm CDT Jul 21, 2025
 
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Additional Resources

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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