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Weather in Princeton, New Jersey for September 2026

Your guide to Princeton weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Coastal Flood Advisory - See hour by hour.

    • Temperatures

  • So far, September 2026 in Princeton is slightly warmer than the historical average by 1.6 °F.

  • The forecast for the next days in Princeton predicts temperatures to be around 21 °F, close to the historical average.

  • In general, the average temperature in Princeton at the beginning of September is 26.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.3 °F by the end of September.

    • Rain 🌧️

  • The climate of Princeton in September is notably wet, with an average of 15 rainy days, and a total of 169.5 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
15
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/15°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Princeton Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain shower
28°
2
Partly cloudy
26°
3
Sunny
26°
4
Partly cloudy
28°
5
Sunny
28°
6
Patchy rain possible
27°
7
Light rain shower
23°
8
Sunny
25°
9
Sunny
25°
10
Sunny
26°
11
Partly cloudy
27°
12
Sunny
26°
13
Sunny
27°
14
Sunny
27°
15
Sunny
25°
16
Partly cloudy
26°
17
Fog
23°
18
Fog
25°
19
Overcast
24°
20
Moderate or heavy rain shower
21°
21
Overcast
22°
22
Moderate rain at times
22°
23
Overcast
22°
24
Weather Alert Overcast
20°
25
Weather Alert Overcast
23°
26
Light rain
15°
27
Light drizzle
15°
28
Overcast
23°
29
Sunny
25°
30
Sunny
28°

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
August October
Date Weather Temperatures Rain UV More
Sept. 1 Light rain shower
Light rain shower
 28° /18° 1.4 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 26° /16° 0.2 mm 5
Sept. 3 Sunny
Sunny
 26° /14° 20.6 mm 4
Sept. 4 Partly cloudy
Partly cloudy
 28° /16° 2.4 mm 6
Sept. 5 Sunny
Sunny
 28° /17° 11.7 mm 6
Sept. 6 Patchy rain possible
Patchy rain possible
 27° /18° 13.6 mm 7
Sept. 7 Light rain shower
Light rain shower
 23° /13° 29.3 mm 6
Sept. 8 Sunny
Sunny
 25° /10° 0 mm 6
Sept. 9 Sunny
Sunny
 25° /13° 0 mm 5
Sept. 10 Sunny
Sunny
 26° /16° 0 mm 5
Sept. 11 Partly cloudy
Partly cloudy
 27° /15° 0 mm 6
Sept. 12 Sunny
Sunny
 26° /14° 0.1 mm 6
Sept. 13 Sunny
Sunny
 27° /16° 11.5 mm 5
Sept. 14 Sunny
Sunny
 27° /16° 0.1 mm 7
Sept. 15 Sunny
Sunny
 25° /14° 0 mm 6
Sept. 16 Partly cloudy
Partly cloudy
 26° /15° 0 mm 6
Sept. 17 Fog
Fog
 23° /17° 2 mm 5
Sept. 18 Fog
Fog
 25° /18° 0 mm 6
Sept. 19 Overcast
Overcast
 24° /16° 4.1 mm 4
Sept. 20 Moderate or heavy rain shower
Moderate or heavy rain shower
 21° /16° 5.3 mm 3
Sept. 21 Overcast
Overcast
 22° /15° 1 mm 3
Sept. 22 Moderate rain at times
Moderate rain at times
 22° /13° 1.6 mm 4
Sept. 23 Overcast
Overcast
 22° /15° 0.6 mm 4
Sept. 24 Overcast
Overcast
 20° /10° 0 mm 5.2
Sept. 25 Overcast
Overcast
 23° /13° 0 mm 5.3
Sept. 26 Light rain
Light rain
 15° /12° 20.7 mm 0.7
Sept. 27 Light drizzle
Light drizzle
 15° /12° 10.8 mm 0.8
Sept. 28 Overcast
Overcast
 23° /15° 0.1 mm 3.7
Sept. 29 Sunny
Sunny
 25° /14° 0 mm 7
Sept. 30 Sunny
Sunny
 28° /15° 0 mm 7
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
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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?
Significant rainfall exceeding 169.5 mm is expected in Princeton during September, occurring over more than 15 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 15 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 15 rainy days in September with a total of 169.5 mm of rainfall.

UV exposure in Princeton during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates 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.

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