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

In Philadelphia during September average daily high temperatures decrease from 82°F to 72°F and it is overcast or mostly cloudy about 37% of the time.

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

Daytime high temperatures tend to average near 81-82 F (27-28 C) early in September, cooling down to around 73-75 F (23-24 C) near the end of the month.

The temperature reaches around 26℃ during the daytime in September, falling away to 17℃ at night. The UV index will be moderate at this time of year, so not ...

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

During the month of September, Philadelphia, PA, has an average daytime high temperature of 81°F and an average overnight low temperature dropping to 63°F.

Philadelphia September · 68%. air humidity. air humidity 68% · 3.0 m/s. Wind N Wind northerly 3.0 Meters per second · 88 mm. precipitation. (9% of annual average).

The weather in Philadelphia in September is pleasantly warm and breezy, with average highs of 80°F (27°C) and lows of 60°F (15°C).

Daily high temperatures decrease by 10°F, from 82°F to 72°F, rarely falling below 62°F or exceeding 89°F.