Princeton
September
Weather in Princeton for September 2025
Your guide to Princeton weather in September - trends and predictions
In general, the average temperature in Princeton at the beginning of September is 24 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.9 °F by the end of September.
Princeton experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 80.2 mm.
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Temperatures
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
23°/15°
Temperatures
16 km/h
Avg max wind
72 %
Avg humidity
Princeton in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2  25° | 3  23° | 4 24° | 5 25° | 6 22° | 7 22° |
| 8 21° | 9 24° | 10 26° | 11 26° | 12 27° | 13 28° | 14 28° |
| 15 27° | 16 25° | 17  20° | 18 20° | 19  23° | 20  20° | 21 23° |
| 22  21° | 23 19° | 24 18° | 25 19° | 26 25° | 27 21° | 28 20° |
| 29  17° | 30 19° |
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Temperatures trend during September in Princeton
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 | Light rain shower | 27° /20° | 3.1 mm | 6 | |
| Sept. 2 | Partly cloudy | 25° /15° | 0 mm | 6 | |
| Sept. 3 | Sunny | 23° /11° | 0 mm | 6 | |
| Sept. 4 | Partly cloudy | 24° /12° | 0 mm | 6 | |
| Sept. 5 | Sunny | 25° /13° | 0 mm | 6 | |
| Sept. 6 | Patchy rain possible | 22° /16° | 0.1 mm | 5 | |
| Sept. 7 | Light rain shower | 22° /12° | 5.8 mm | 5 | |
| Sept. 8 | Sunny | 21° /9° | 0 mm | 6 | |
| Sept. 9 | Sunny | 24° /10° | 0 mm | 6 | |
| Sept. 10 | Sunny | 26° /14° | 0 mm | 7 | |
| Sept. 11 | Partly cloudy | 26° /13° | 0 mm | 7 | |
| Sept. 12 | Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 13 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 14 | Sunny | 28° /16° | 0 mm | 7 | |
| Sept. 15 | Sunny | 27° /16° | 0 mm | 7 | |
| Sept. 16 | Partly cloudy | 25° /15° | 0 mm | 6 | |
| Sept. 17 | Fog | 20° /17° | 0 mm | 5 | |
| Sept. 18 | Fog | 20° /17° | 0 mm | 5 | |
| Sept. 19 | Overcast | 23° /18° | 12.3 mm | 5 | |
| Sept. 20 | Moderate or heavy rain shower | 20° /17° | 9.8 mm | 5 | |
| Sept. 21 | Overcast | 23° /18° | 0 mm | 5 | |
| Sept. 22 | Cloudy | 21° /14° | 0 mm | 5 | |
| Sept. 23 | Overcast | 19° /14° | 0 mm | 4 | |
| Sept. 24 | Overcast | 18° /16° | 2.4 mm | 4 | |
| Sept. 25 | Moderate or heavy rain shower | 19° /16° | 20.5 mm | 4 | |
| Sept. 26 | Overcast | 25° /19° | 7.1 mm | 6 | |
| Sept. 27 | Fog | 21° /18° | 5.4 mm | 5 | |
| Sept. 28 | Overcast | 20° /17° | 3.5 mm | 5 | |
| Sept. 29 | Light rain | 17° /15° | 10 mm | 4 | |
| Sept. 30 | Overcast | 19° /15° | 0 mm | 4 | |
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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.
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 23° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Princeton during September?
Moderate rainfall is anticipated in Princeton during September, with a total of 80.2 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
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 💧
UV exposure in Princeton during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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