Weather Forecast September 2024 Philadelphia. This amount contributes to the overall pleasant weather during this month, marking a. September and october will be cooler than normal in the north and warmer than normal in the south, with below.

The temperatures in philadelphia in september are comfortable with low of 62 ° f and and high up to 78 ° f. September 7, 2024 / 9:41 am edt / cbs philadelphia.