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Weather in Philadelphia County for September 2025

Your guide to Philadelphia County weather in September - trends and predictions
  • In general, the average temperature in Philadelphia County at the beginning of September is 29.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °F by the end of September.

  • The climate of Philadelphia County in September is notably wet, with an average of 14 rainy days.

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Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/16°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Philadelphia County in September average weather

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Temperatures trend during September in Philadelphia County

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
28° /18° 2.6 mm 7
Sept. 2 Sunny
Sunny
28° /17° 0 mm 7
Sept. 3 Sunny
Sunny
29° /16° 0 mm 7
Sept. 4 Thundery outbreaks possible
Thundery outbreaks possible
30° /19° 0 mm 7
Sept. 5 Cloudy
Cloudy
32° /19° 0 mm 8
Sept. 6 Sunny
Sunny
30° /21° 0.2 mm 7
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
30° /19° 1.7 mm 7
Sept. 8 Thundery outbreaks possible
Thundery outbreaks possible
28° /17° 1.2 mm 7
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
29° /17° 2.3 mm 7
Sept. 10 Patchy rain possible
Patchy rain possible
30° /19° 0.4 mm 7
Sept. 11 Moderate or heavy rain shower
Moderate or heavy rain shower
29° /18° 5.9 mm 7
Sept. 12 Overcast
Overcast
29° /18° 3.2 mm 7
Sept. 13 Light rain shower
Light rain shower
27° /17° 4.9 mm 7
Sept. 14 Partly cloudy
Partly cloudy
27° /17° 0 mm 7
Sept. 15 Sunny
Sunny
27° /15° 0 mm 7
Sept. 16 Cloudy
Cloudy
26° /14° 0 mm 6
Sept. 17 Light drizzle
Light drizzle
24° /16° 0.3 mm 6
Sept. 18 Light rain shower
Light rain shower
22° /16° 7.6 mm 5
Sept. 19 Mist
Mist
24° /15° 17.8 mm 6
Sept. 20 Partly cloudy
Partly cloudy
23° /16° 0 mm 6
Sept. 21 Mist
Mist
26° /16° 0 mm 6
Sept. 22 Mist
Mist
22° /15° 0 mm 5
Sept. 23 Heavy rain
Heavy rain
20° /15° 22.4 mm 5
Sept. 24 Light rain shower
Light rain shower
19° /15° 15.7 mm 5
Sept. 25 Light drizzle
Light drizzle
19° /15° 29.6 mm 5
Sept. 26 Light drizzle
Light drizzle
21° /16° 1.2 mm 5
Sept. 27 Overcast
Overcast
21° /16° 0 mm 5
Sept. 28 Overcast
Overcast
21° /14° 5.2 mm 5
Sept. 29 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
18° /15° 35.5 mm 4
Sept. 30 Light rain
Light rain
21° /15° 0.8 mm 5
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Important Notice
Our weather forecast for Philadelphia County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Philadelphia County forecast closer to your planned date for the most up-to-date weather information.

Philadelphia County in September - FAQ

What are the expected maximum and minimum temperatures in Philadelphia County during September?
During September, expect a variety of temperatures with highs around 26° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Philadelphia County during September?
Significant rainfall exceeding 198.6 mm is expected in Philadelphia County during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Philadelphia County during September?
The average wind speed in Philadelphia County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Philadelphia County

Explore the daily rainfall trends and prepare for Philadelphia Countys September weather 💧

UV exposure in Philadelphia County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Philadelphia County?

Get accurate weather forecasts for Philadelphia County, located at latitude 39.952 and longitude -75.164. Stay updated with localized weather information tailored for Philadelphia County.

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