Philadelphia weather in September 2025

Expect 77°F daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Philadelphia in September. Check more long-term weather averages for Philadelphia in September before you book your next holiday to Pennsylvania in 2025/2026.

  • 77°F maximum daytime temperature in September in Philadelphia77
    77°F max day temperature
  • 7 hours of sunshine per day
  • 8 days with some rainfall in September in Philadelphia8
    8 days with some rainfall
  • 57°F minimum night-time temperature in September in Philadelphia57
    57°F min night temperature
  • 12 hours of daylight per day in September in Philadelphia12
    12 hours of daylight per day
  • No heat & humidity in September in Philadelphia0
    No heat & humidity
  • 3.6 inches monthly rainfall in September in Philadelphia3.6
    3.6 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Philadelphia6
    6 (High) UV index

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The September weather guide for Pennsylvania (Philadelphia) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Philadelphia in September?

Daytime temperatures usually reach 77°F in Philadelphia in September with no heat and humidity, falling to 57°F at night.

How sunny is it in Philadelphia in September?

There are normally 7 hours of bright sunshine each day in Philadelphia in September - that's 58% of daylight hours.

Does it rain in Philadelphia in September?

There are usually 8 days with some rain in Philadelphia in September and the average monthly rainfall is 3.6 inches.

What is the chance of a hurricane in Philadelphia in September?

On average less than 1 day in September in Philadelphia is likely to be affected by the passage of one or more tropical storms.

Philadelphia September sunrise & sunset times

Browse the sunrise and sunset times for Philadelphia in September 2025. Select a month to view Philadelphia sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:29 18:32
Monday, 15th September 2025 05:42 18:09
Tuesday, 30th September 2025 05:56 17:44

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