Philadelphia
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Philadelphia, PA

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The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
September crowns the summer amid warm and pleasant weather. The mercury drops to the warm and pleasant range of 60.3°F (15.7°C) to 78.1°F (25.6°C), and the excess summer heat dies off.
The highest humidity of the year is registered in September, averaging 71.6% and the days feel muggy but tolerable. With up to seven hours of sunshine, tourists still enjoy outdoor activities late into the evening. An increase in rainfall sees Philadelphia register moderately high precipitation of 3.8" (96.5mm), collected from approximately eight and a half rainfall days.
The crowds in Philadelphia begin to thin out as summer comes to an end, leaving enough room to tour the various attraction spots without a hustle.
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  • The average high temperature in September: 78°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (40.3°F).

  • The average low temperature in September: 60.3°F

The month with the highest average low temperature is July (69.2°F).
The coldest month (with the lowest average low temperature) is January (25.6°F).

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  • The average humidity in September: 71.6%

The month with the highest relative humidity is September (71.6%).
The month with the lowest relative humidity is April (60.4%).

  • The average rainfall in September: 3.8"

The wettest month (with the highest rainfall) is July (4.4").
The driest month (with the lowest rainfall) is February (2.7").

  • The average rainfall days in September: 8.7 days

The month with the highest number of rainy days is April (11.3 days).
The month with the lowest number of rainy days is August (8.4 days).

  • The average snowfall in September: 0"

The month with the highest snowfall is February (8.8").
Months with the lowest snowfall are May, June, July, August, September and October (0").

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.4 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

  • The average sea temperature in September: 71.4°F

The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

  • The average daylight in September: 12h

Months with the longest days are June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The average sunshine in September: 7.3h

The month with most sunshine is June (Average sunshine: 9h).
The month with least sunshine is December (Average sunshine: 4.4h).

  • The average UV index in September: 6

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).

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