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

Dangerous Heat in the Central U.S. and Northeast; Heavy Rainfall Across the Gulf Coast

A significant heat wave is underway for the Intermountain West, Northern Plains, and Upper Great Lakes, peaking in intensity through Tuesday. This heat is expected to be exceptionally rare and produce numerous high temperature records. Showers and thunderstorms with the potential to produce heavy rainfall and flash flooding is expected across the Gulf Coast. Read More >

Hazardous Weather Conditions

Current conditions at

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

Fair

81°F

27°C

Humidity 49%
Wind Speed SW 10 mph
Barometer 30.17 in (1021.5 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 13 Jul 7:54 pm EDT
Extended Forecast for

Chester PASimilar City Names

Extreme Heat Watch July 15, 10:00am until July 15, 08:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Tonight

    Tonight: Clear, with a low around 66. Southwest wind around 5 mph.

    Low: 66 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91. Southwest wind 5 to 10 mph.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. Southwest wind around 10 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. Heat index values as high as 105. West wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. West wind around 5 mph becoming calm after midnight.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 66. Southwest wind around 5 mph.
Tuesday
Sunny, with a high near 91. Southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 75. Southwest wind around 10 mph.
Wednesday
Sunny and hot, with a high near 99. Heat index values as high as 105. West wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 76. West wind around 5 mph becoming calm after midnight.
Thursday
Mostly sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 74.
Friday
Sunny, with a high near 94.
Friday Night
Mostly clear, with a low around 73.
Saturday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Chance of precipitation is 50%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chester PASimilar City Names
 39.85°N 75.38°W (Elev. 30 ft)
Last Update:
8:18 pm EDT Jul 13, 2026
Forecast Valid:
8pm EDT Jul 13, 2026-6pm EDT Jul 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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