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Average temperatures for September at cities, communities and other locations throughout Pennsylvania are listed below in degrees Fahrenheit and Celsius.

In September Philadelphia generally has high temperatures with maximum daytime temperatures around 26°C, minimum nighttime temperatures around 17°C and high ...

In Philadelphia, the average temperature for September is around 69°F (20.5°C), with highs reaching up to approximately 77.5°F (25.3°C) and lows dropping to ...

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In general, the average temperature in Pennsylvania at the beginning of September is 85 °F. · The climate of Pennsylvania in September is notably wet, with an ...

In Pittsburgh during September average daily high temperatures decrease from 79°F to 69°F and it is overcast or mostly cloudy about 36% of the time.

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.

Daytime temperatures usually reach 25°C in Philadelphia, Pennsylvania in September with no heat and humidity, falling to 14°C at night.