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How is the Weather in Philadelphia During August?

Updated: May 12, 2024

Philadelphia in August features warm afternoons and evenings with comfortable late nights and mornings. About 15 days this month will be considered humid.


Daytime high temperatures tend to average 86-88 F (30-31 C) early in the month, decreasing to 82-84 F (28-29 C) near the end of the month. 

About 7-8 days this month will reach highs of 90 F (32 C) or more. The record high temperature in Philadelphia during August is 101 F (38.3 C).

Late night and early morning lows tend to average 70-72 F (21-22 C) early in August, cooling to 65-66 F (18-19 C) near the end of the month.

A few of the cooler mornings, especially towards the end of the month, can dip down around 57 F (14 C). 

The record low temperature in Philadelphia during August is 44 F (6.7 C).  

Sky and Rain

On average, you can expect about 9 mostly sunny, 11 partly sunny, and 11 mostly cloudy days this month. 

Some measurable rain falls on about 8-9 days, however, only about 3 days will record rainfalls of 0.5 inches (12.7 mm) or more.

About 5 days will produce thunderstorms. 


The number of daylight hours falls this month from about 14.3 hours on the 1st to about 13.1 hours by the 31st.


Wind speeds generally are light during August, averaging 4-7 mph (6-11 kph) but can briefly be gentle at 8-12 mph (12-19 kph).

Briefly higher wind gusts are likely during thunderstorms. 

What to Wear in Philadelphia During August?

Summer tends to be hot and humid in Philadelphia so dress light and airy.

You can pack both long and short-sleeve tops, light colored jeans, a windbreaker, sneakers and some comfortable walking shoes. 

A light rain jacket or umbrella will come in handy for the rainy days.

Things to Do in Philadelphia in August

Although it will be pretty warm this month, things should start cooling down toward the end of August, so that might be a good time to consider taking a pay-what-you-wish Philadelphia walking tour.

Since it's still the summer, this would also be a good time to visit the ballpark and catch a Philadelphia Phillies game!

There will undoubtedly be plenty of great concerts to attend, and the Off-Broadway production of The Lion King will be coming to town however dates of 2024 are yet to be confirmed.

For even more ideas, make sure to read our full post covering things to do in Philadelphia.

Fred Pickhardt  
Ocean Weather Services 

About The Author

Fred Pickhardt

Fred is a marine meteorologist and sailed briefly with American Export Lines in the Far East trade. He has extensive experience in weather analysis, weather forecasting, and forensic weather event reconstructions. Fred founded Ocean Weather Services and currently provides forensic marine weather reports to the maritime industry.
Updated: May 12th, 2024
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