Philadelphia
September
Weather in Philadelphia for September 2025
Your guide to Philadelphia weather in September - trends and predictions
In general, the average temperature in Philadelphia at the beginning of September is 28 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.4 °F by the end of September.
Philadelphia in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 121.2 mm.
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Temperatures
Rain 🌧️
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10
Dry days
20
Rainy days
0
Snow days
25°/17°
Temperatures
15 km/h
Avg max wind
66 %
Avg humidity
Philadelphia in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  27° | 3 28° | 4 29° | 5  29° | 6 28° | 7  27° |
| 8  28° | 9 28° | 10 29° | 11 27° | 12 29° | 13 28° | 14 28° |
| 15 28° | 16 26° | 17 25° | 18 26° | 19 27° | 20 26° | 21 27° |
| 22 24° | 23  21° | 24 21° | 25 22° | 26 23° | 27 23° | 28 21° |
| 29 20° | 30 20° |
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Temperatures trend during September in Philadelphia
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 | 28° /18° | 8 mm | 7 | |
| Sept. 2 | Overcast | 27° /16° | 2.2 mm | 7 | |
| Sept. 3 | Sunny | 28° /16° | 0 mm | 7 | |
| Sept. 4 | Sunny | 29° /18° | 0 mm | 7 | |
| Sept. 5 | Cloudy | 29° /19° | 1.4 mm | 7 | |
| Sept. 6 | Overcast | 28° /19° | 7.2 mm | 6 | |
| Sept. 7 | Partly cloudy | 27° /18° | 1.1 mm | 6 | |
| Sept. 8 | Patchy rain possible | 28° /17° | 1.9 mm | 7 | |
| Sept. 9 | Sunny | 28° /17° | 3 mm | 7 | |
| Sept. 10 | Sunny | 29° /17° | 0.2 mm | 7 | |
| Sept. 11 | Sunny | 27° /17° | 8.4 mm | 6 | |
| Sept. 12 | Sunny | 29° /18° | 4 mm | 7 | |
| Sept. 13 | Sunny | 28° /18° | 4.6 mm | 7 | |
| Sept. 14 | Partly cloudy | 28° /17° | 0.1 mm | 7 | |
| Sept. 15 | Sunny | 28° /17° | 1.6 mm | 7 | |
| Sept. 16 | Cloudy | 26° /15° | 0.6 mm | 6 | |
| Sept. 17 | Patchy rain possible | 25° /17° | 0.2 mm | 6 | |
| Sept. 18 | Partly cloudy | 26° /17° | 3.8 mm | 6 | |
| Sept. 19 | Sunny | 27° /17° | 8.9 mm | 6 | |
| Sept. 20 | Sunny | 26° /16° | 0 mm | 6 | |
| Sept. 21 | Partly cloudy | 27° /16° | 0 mm | 7 | |
| Sept. 22 | Patchy rain possible | 24° /16° | 2.9 mm | 5 | |
| Sept. 23 | Moderate or heavy rain shower | 21° /14° | 13.8 mm | 5 | |
| Sept. 24 | Sunny | 21° /13° | 8.3 mm | 5 | |
| Sept. 25 | Overcast | 22° /14° | 15.7 mm | 5 | |
| Sept. 26 | Partly cloudy | 23° /15° | 0.7 mm | 5 | |
| Sept. 27 | Overcast | 23° /15° | 0 mm | 5 | |
| Sept. 28 | Moderate or heavy rain shower | 21° /13° | 3 mm | 5 | |
| Sept. 29 | Partly cloudy | 20° /13° | 17.8 mm | 5 | |
| Sept. 30 | Sunny | 20° /14° | 1.7 mm | 5 | |
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Important Notice
Our weather forecast for Philadelphia 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 forecast closer to your planned date for the most up-to-date weather information.
Philadelphia in September - FAQ
What are the expected maximum and minimum temperatures in Philadelphia during September?
During September, expect a variety of temperatures with highs around 25° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Philadelphia during September?
Significant rainfall exceeding 121.2 mm is expected in Philadelphia during September, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Philadelphia during September?
The average wind speed in Philadelphia during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Philadelphia
Explore the daily rainfall trends and prepare for Philadelphias September weather 💧
UV exposure in Philadelphia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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