Philadelphia Weather in August

The climate in Philadelphia during August can be summarized as hot, humid and damp.

August is in the summer in Philadelphia and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 18°C (65°F) is normal.

On average August is the 2nd wettest month of the year in Philadelphia with around 114mm 4.5 inches of rain making it a damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 9 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Philadelphia in August 2024.