Princeton (NJ) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Princeton.
Climate overview of Princeton
Temperatures in Princeton, New Jersey, United States of America, vary greatly throughout the year. July is the hottest month at 31°C (88°F), while January is the coldest at 4°C (39°F).
The city has a wet climate, receiving around 1267 mm (50 in) of rain/snowfall per year. Despite the high annual total, it has very warm summers and cold winters. July is the wettest month. Sunshine peaks in July, when the city sees around 9.0 hours of sunshine per day.
Princeton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Princeton - and find the best time to visit.
Monthly Temperature in Princeton
The climate in Princeton is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 4°C (39°F) in January.
Nighttime temperatures range from 19°C (66°F) in July to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Princeton
Princeton has a notably wet climate with abundant precipitation, recording 1267 mm (50 in) of rain/snowfall per year. The amount of precipitation varies moderately throughout the year. The wettest month, July, sees around 138 mm (5.4 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, February, still receives a respectable 76 mm (3 in) of snow/rainfall. For more details, please visit our Princeton Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Princeton
In Princeton, summer days are longer and more sunny, with daily sunshine hours peaking at 9.0 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.7 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Best Time to Visit Princeton
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: July and August
- Most sunshine: June and July
- Fewest rainy days: March, September and November
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Princeton
What is the best time to visit Princeton?
September typically offers the most optimal weather in Princeton. In contrast, January, February and December tend to have less optimal conditions. Princeton has very warm summers and cold winters.
What temperatures can I expect in Princeton?
Daytime highs range from 4°C (39°F) in January to 31°C (88°F) in July. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Princeton get?
Annual rainfall is around 1267 mm (50 in). July is the wettest month with 138 mm (5.4 in), while February is the driest with 76 mm (3 in).
How sunny is Princeton?
Princeton receives around 2,502 hours of sunshine per year. July is the sunniest month with 269 hours, while December is the cloudiest with just 140 hours. Overall, Princeton enjoys abundant sunshine.
Princeton 3-Day Forecast
Princeton (NJ) 3-Day Forecast
Princeton on the map
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