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 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 in September is notably wet, with an average of 14 rainy days.
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16
Dry days
14
Rainy days
0
Snow days
26°/16°
Temperatures
15 km/h
Avg max wind
71 %
Avg humidity
Philadelphia in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2 28° | 3 29° | 4  30° | 5  32° | 6 30° | 7 30° |
| 8 28° | 9 29° | 10  30° | 11  29° | 12  29° | 13 27° | 14  27° |
| 15 27° | 16 26° | 17  24° | 18 22° | 19  24° | 20 23° | 21 26° |
| 22 22° | 23  20° | 24 19° | 25 19° | 26 21° | 27 21° | 28 21° |
| 29  18° | 30 21° |
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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° | 2.6 mm | 7 | |
| Sept. 2 | Sunny | 28° /17° | 0 mm | 7 | |
| Sept. 3 | Sunny | 29° /16° | 0 mm | 7 | |
| Sept. 4 | Thundery outbreaks possible | 30° /19° | 0 mm | 7 | |
| Sept. 5 | Cloudy | 32° /19° | 0 mm | 8 | |
| Sept. 6 | Sunny | 30° /21° | 0.2 mm | 7 | |
| Sept. 7 | Thundery outbreaks possible | 30° /19° | 1.7 mm | 7 | |
| Sept. 8 | Thundery outbreaks possible | 28° /17° | 1.2 mm | 7 | |
| Sept. 9 | Thundery outbreaks possible | 29° /17° | 2.3 mm | 7 | |
| Sept. 10 | Patchy rain possible | 30° /19° | 0.4 mm | 7 | |
| Sept. 11 | Moderate or heavy rain shower | 29° /18° | 5.9 mm | 7 | |
| Sept. 12 | Overcast | 29° /18° | 3.2 mm | 7 | |
| Sept. 13 | Light rain shower | 27° /17° | 4.9 mm | 7 | |
| Sept. 14 | Partly cloudy | 27° /17° | 0 mm | 7 | |
| Sept. 15 | Sunny | 27° /15° | 0 mm | 7 | |
| Sept. 16 | Cloudy | 26° /14° | 0 mm | 6 | |
| Sept. 17 | Light drizzle | 24° /16° | 0.3 mm | 6 | |
| Sept. 18 | Light rain shower | 22° /16° | 7.6 mm | 5 | |
| Sept. 19 | Mist | 24° /15° | 17.8 mm | 6 | |
| Sept. 20 | Partly cloudy | 23° /16° | 0 mm | 6 | |
| Sept. 21 | Mist | 26° /16° | 0 mm | 6 | |
| Sept. 22 | Mist | 22° /15° | 0 mm | 5 | |
| Sept. 23 | Heavy rain | 20° /15° | 22.4 mm | 5 | |
| Sept. 24 | Light rain shower | 19° /15° | 15.7 mm | 5 | |
| Sept. 25 | Light drizzle | 19° /15° | 29.6 mm | 5 | |
| Sept. 26 | Light drizzle | 21° /16° | 1.2 mm | 5 | |
| Sept. 27 | Overcast | 21° /16° | 0 mm | 5 | |
| Sept. 28 | Overcast | 21° /14° | 5.2 mm | 5 | |
| Sept. 29 | Moderate or heavy rain with thunder | 18° /15° | 35.5 mm | 4 | |
| Sept. 30 | Light rain | 21° /15° | 0.8 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 26° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Philadelphia during September?
Significant rainfall exceeding 198.6 mm is expected in Philadelphia 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 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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