Briefing for Heat, Severe Storm, and Flash Flood Risks through Thursday

Dangerously hot and humid conditions are expected through Wednesday. There is also a threat of isolated severe thunderstorms on Wednesday. Flash flooding from locally heavy rainfall is possible on Thursday. See this briefing for details on these hazards. Read More >

Hazardous Weather Conditions

Current conditions at

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

A Few Clouds

89°F

32°C

Humidity	63%
Wind Speed	W 8 mph
Barometer	30.00 in (1015.7 mb)
Dewpoint	75°F (24°C)
Visibility	10.00 mi
Heat Index	99°F (37°C)
Last update	29 Jul 9:54 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

3 Miles WNW Williamstown NJ

Heat Advisory July 29, 10:55pm until July 30, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory July 29, 10:55pm until July 30, 08:00pm
NOW until 8:00pm Wed
Heat Advisory
Tonight
Low: 75 °F
Partly Cloudy
Wednesday
High: 97 °F
Hot
Wednesday Night
Low: 74 °F
Mostly Clear
then Slight
Chance
Showers
Thursday
High: 90 °F
Slight Chance
Showers then
Heavy Rain
Thursday Night
Low: 67 °F
Heavy Rain
Friday
High: 72 °F
Showers
Likely then
Chance
T-storms
Friday Night
Low: 61 °F
Mostly Cloudy
Saturday
High: 80 °F
Sunny

Detailed Forecast

Tonight

Partly cloudy, with a low around 75. Calm wind.

Wednesday

Sunny and hot, with a high near 97. Heat index values as high as 103. Calm wind becoming southwest around 5 mph in the afternoon.

Wednesday Night

A slight chance of showers after 2am. Mostly clear, with a low around 74. South wind around 5 mph. Chance of precipitation is 20%.

Thursday

A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 90. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 67. Northeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

Friday

Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms after 8am. Cloudy, with a high near 72. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night

Mostly cloudy, with a low around 61.

Saturday

Sunny, with a high near 80.

Saturday Night

Mostly clear, with a low around 59.

Sunday

Sunny, with a high near 83.

Sunday Night

Partly cloudy, with a low around 61.

Monday

Mostly sunny, with a high near 84.