1. United States
  2. Pennsylvania
  3. Philadelphia
  4. September

Philadelphia, PA Climate in September

Temperature for September

In Philadelphia, PA during September the average high temperature is 79.8°F. The hottest day on record was September 1, 1973 when the temperature hit 98.6°F.

Philadelphia, PA daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 59.5°F, with the lowest temperature of 32.7°F being recorded on September 24, 1983. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in Philadelphia, PA is 4.24 inches with rain usually falling on between 9 and 10 days. 2005 was the driest September with only 0.21 inches of rain falling, and 1999 was the wettest September with 13.14 inches of rain. The wettest single day in September was 17 September 1999 when 5.44 inches of rain fell.

There are thunderstorms on between 2 and 3 days in September.
Show Year
Month Summary
JanuaryFebruaryMarchApril
MayJuneJulyAugust
SeptemberOctoberNovemberDecember