Philadelphia weather in September is a kaleidoscope of color. It is simply beautiful! The trees are beginning to put on their display and the air turns to a refreshingly sunny coolness.

The month is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 82°F to 71°F over the course of the month, exceeding 89°F or dropping below 62°F only one day in ten. During the conference time [September 7-8-9], the average daily high temperature is expected to be 79°F, and the low temperature will likely fall to 60°F. You might want to bring a jacket with you for the evenings. It’s best not to be cold as you run up the steps of the Art Museum – Rocky Style!

Philadelphia’s Weather Averages