Princeton (NJ)
September
Weather in Princeton, New Jersey for September 2027
Your guide to Princeton weather in September - trends and predictions
In general, the average temperature in Princeton at the beginning of September is 26 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.3 °C by the end of September.
Princeton experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 178.7 mm.
Is September a good time to visit Princeton? check out the best time to travel to Princeton page.
✨ Is September a good time to visit Princeton? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
24°/16°
Temperatures
16 km/h
Avg max wind
73 %
Avg humidity
Princeton Weather September
Move between months or click on a day
Temperatures trend during September in Princeton
See the weather trend as well as the moving average line
September weather in Princeton day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 27° /18° | 1.4 mm | 6 | |
| Sept. 2 |  Partly cloudy | 25° /16° | 0.2 mm | 5 | |
| Sept. 3 |  Moderate rain | 26° /15° | 20.6 mm | 4 | |
| Sept. 4 | Patchy rain possible | 27° /17° | 2.4 mm | 6 | |
| Sept. 5 | Moderate rain | 27° /17° | 11.7 mm | 6 | |
| Sept. 6 | Moderate rain | 27° /18° | 13.6 mm | 7 | |
| Sept. 7 |  Heavy rain | 22° /13° | 29.3 mm | 6 | |
| Sept. 8 |  Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 9 | Sunny | 25° /13° | 0 mm | 5 | |
| Sept. 10 | Sunny | 25° /17° | 0 mm | 5 | |
| Sept. 11 | Partly cloudy | 26° /16° | 0 mm | 6 | |
| Sept. 12 | Sunny | 26° /14° | 0.1 mm | 6 | |
| Sept. 13 | Moderate rain | 26° /17° | 11.5 mm | 5 | |
| Sept. 14 | Sunny | 26° /16° | 0.1 mm | 7 | |
| Sept. 15 | Sunny | 25° /15° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 25° /15° | 0 mm | 6 | |
| Sept. 17 | Patchy rain possible | 23° /17° | 2 mm | 5 | |
| Sept. 18 |  Fog | 24° /18° | 0 mm | 6 | |
| Sept. 19 |  Light rain | 24° /16° | 4.1 mm | 4 | |
| Sept. 20 |  Moderate or heavy rain shower | 20° /16° | 5.3 mm | 3 | |
| Sept. 21 | Patchy rain possible | 22° /15° | 1 mm | 3 | |
| Sept. 22 | Patchy rain possible | 21° /14° | 1.6 mm | 4 | |
| Sept. 23 |  Overcast | 22° /15° | 0.6 mm | 4 | |
| Sept. 24 | Overcast | 21° /15° | 0.8 mm | 4 | |
| Sept. 25 | Moderate rain | 22° /15° | 17.7 mm | 3 | |
| Sept. 26 | Moderate rain | 22° /17° | 13.9 mm | 4 | |
| Sept. 27 | Moderate rain | 21° /16° | 19.3 mm | 4 | |
| Sept. 28 | Moderate rain | 20° /16° | 18.1 mm | 4 | |
| Sept. 29 | Light rain | 21° /15° | 3.3 mm | 3 | |
| Sept. 30 | Overcast | 22° /15° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Princeton 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 Princeton forecast closer to your planned date for the most up-to-date weather information.
Change Month
Princeton in September - FAQ
What are the expected maximum and minimum temperatures in Princeton during September?
During September, expect a variety of temperatures with highs around 24° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Princeton during September?
Significant rainfall exceeding 178.7 mm is expected in Princeton during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Princeton during September?
The average wind speed in Princeton during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Princeton
Explore the daily rainfall trends and prepare for Princetons September weather 💧
Typically, Princeton has 10 rainy days in September with a total of 178.7 mm of rainfall.
UV exposure in Princeton during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Princeton weather pages
You are here
Where is Princeton?Get accurate weather forecasts for Princeton, located at latitude 40.349 and longitude -74.659. Stay updated with localized weather information tailored for Princeton.
Found a mistake?
We appreciate your attention to details. Tell us here.