Pennsylvania (Philadelphia)
September
Weather in Pennsylvania for September 2025
Your guide to Pennsylvania weather in September - trends and predictions
In general, the average temperature in Pennsylvania 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 Pennsylvania in September is notably wet, with an average of 14 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
16
Dry days
14
Rainy days
0
Snow days
26°/16°
Temperatures
15 km/h
Avg max wind
71 %
Avg humidity
Pennsylvania in September average weather
Move between months or click on a day
| 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° |
You can click on date
Access Pennsylvania weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Pennsylvania
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| 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 | |
| Next | |||||
Important Notice
Our weather forecast for Pennsylvania 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 Pennsylvania forecast closer to your planned date for the most up-to-date weather information.
Pennsylvania in September - FAQ
What are the expected maximum and minimum temperatures in Pennsylvania 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 Pennsylvania during September?
Significant rainfall exceeding 198.6 mm is expected in Pennsylvania during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Pennsylvania during September?
The average wind speed in Pennsylvania during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Pennsylvania
Explore the daily rainfall trends and prepare for Pennsylvanias September weather 💧
UV exposure in Pennsylvania during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Pennsylvania
Select a province for an accurate weather forecast
Top locations in Pennsylvania
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Pennsylvania?Get accurate weather forecasts for Pennsylvania, located at latitude 39.952 and longitude -75.164. Stay updated with localized weather information tailored for Pennsylvania.
Found a mistake?
We appreciate your attention to details. Tell us here.