Philadelphia (PA)
September
Weather in Philadelphia, Pennsylvania for September 2026
Your guide to Philadelphia weather in September - trends and predictions
So far, September 2026 in Philadelphia is slightly warmer than the historical average by 1.3 °F.
The forecast for the next days in Philadelphia predicts temperatures to be around 27 °F, close to the historical average.
In general, the average temperature in Philadelphia at the beginning of September is 28.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.3 °F by the end of September.
Philadelphia experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 139.3 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
25°/17°
Temperatures
15 km/h
Avg max wind
67 %
Avg humidity
Philadelphia Weather September
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Temperatures trend during September in Philadelphia
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September weather in Philadelphia day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /19° | 5.7 mm | 6 | |
| Sept. 2 |  Overcast | 27° /17° | 3.7 mm | 6 | |
| Sept. 3 | Sunny | 28° /17° | 47.6 mm | 6 | |
| Sept. 4 | Sunny | 30° /18° | 0.1 mm | 7 | |
| Sept. 5 |  Cloudy | 29° /19° | 4.3 mm | 6 | |
| Sept. 6 | Sunny | 29° /19° | 13.9 mm | 7 | |
| Sept. 7 |  Partly cloudy | 26° /17° | 9.6 mm | 6 | |
| Sept. 8 | Sunny | 28° /16° | 1.2 mm | 7 | |
| Sept. 9 | Sunny | 27° /17° | 2 mm | 6 | |
| Sept. 10 |  Light rain shower | 24° /21° | 5.7 mm | 2.8 | |
| Sept. 11 | Overcast | 26° /19° | 3.4 mm | 6.8 | |
| Sept. 12 | Overcast | 27° /18° | 2.2 mm | 6.6 | |
| Sept. 13 | Light rain shower | 27° /20° | 10.4 mm | 6 | |
| Sept. 14 | Overcast | 30° /20° | 0 mm | 7 | |
| Sept. 15 | Sunny | 31° /22° | 0 mm | 8 | |
| Sept. 16 | Sunny | 30° /22° | 2 mm | 7 | |
| Sept. 17 | Overcast | 26° /18° | 0 mm | 7 | |
| Sept. 18 | Sunny | 26° /18° | 0 mm | 7 | |
| Sept. 19 | Overcast | 27° /18° | 1.7 mm | 7 | |
| Sept. 20 | Patchy rain possible | 27° /19° | 0.6 mm | 6 | |
| Sept. 21 |  Mist | 25° /20° | 0.1 mm | 6 | |
| Sept. 22 | Patchy rain possible | 25° /22° | 1.4 mm | 6 | |
| Sept. 23 | Overcast | 22° /15° | 11 mm | 5 | |
| Sept. 24 | Sunny | 22° /15° | 6.6 mm | 5 | |
| Sept. 25 |  Moderate or heavy rain shower | 23° /15° | 19.3 mm | 5 | |
| Sept. 26 | Partly cloudy | 24° /16° | 2.9 mm | 5 | |
| Sept. 27 | Fog | 24° /15° | 0 mm | 5 | |
| Sept. 28 | Moderate or heavy rain shower | 21° /14° | 12.1 mm | 5 | |
| Sept. 29 | Partly cloudy | 21° /14° | 14.2 mm | 5 | |
| Sept. 30 | Overcast | 21° /14° | 1.4 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.
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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 139.3 mm is expected in Philadelphia during September, occurring over more than 9 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 💧
Typically, Philadelphia has 9 rainy days in September with a total of 139.3 mm of rainfall.
UV exposure in Philadelphia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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