Typical Weather

Weather in Philadelphia in September

How warm is it in Philadelphia in September?

In September the typical daytime high in Philadelphia is 25.9 °C on average, from 28.3 °C at the start to 23.1 °C at the end of the month.

That is 3.5 °C cooler than in August and 5.9 °C warmer than in October.

The last 10 years were 1.0 °C warmer than more than 40 years ago.

Click a day for more: afternoon and night, the usual range, records and how fast it is warming.

The average of the weather stations Dover (94 km), Newark Liberty Intl Ap (117 km) and Ny City Cntrl Park (137 km); nearer ones count more.