Get the monthly weather forecast for Philadelphia, PA, including daily high/low, historical averages, to help you plan ahead.

August weather averages for Philadelphia, USA. Temperature, High temperature, Low temperature, Precipitation, Daily sun hours.

Get the monthly weather forecast for Philly, PA, including daily high/low, historical averages, to help you plan ahead.

The weather in Philadelphia in August is very warm and humid but cool, with average highs of 85°F (29°C) and lows of 66°F (19°C).

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

The weather in Philadelphia in August is pleasantly warm and humid but cool, with average highs of 78°F (26°C) and lows of 61°F (16°C).

Philadelphia August Weather ; Average daily high, 85.7 °F ; Average daily low, 68.8 °F ; Average monthly precipitation, 4.3 inches ; Average monthly snow, none.

August weather in Philadelphia for each year since 2010 including high and low temperatures and total amount of rain.

Daytime temperatures usually reach 29°C in Philadelphia in August with moderate heat and humidity, falling to 19°C at night.