The best times to visit Princeton for ideal weather are

April 30th to July 1st

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Princeton Travel Info

Weather in Princeton


Average temperatures in Princeton vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 19th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Princeton, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 88.9°F (31.6°C) with temperatures rarely dropping below 68.8°F (20.4°C) at night.

Princeton Temperatures (Fahrenheit)


Princeton Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Princeton Perceived Temperature (F)


Princeton Perceived Temperature (C)



Average Princeton Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 40.5 32.1 24.6
Feb 41.9 32.8 24.8
Mar 53.4 42.5 33.4
Apr 65.5 53.8 43.5
May 75.8 63.9 52.9
Jun 82.9 72.1 62.2
Jul 87.6 77 67.3
Aug 84.7 74.2 64.5
Sep 79.1 68.3 58.6
Oct 67.3 57 47.7
Nov 55.6 45.9 37.2
Dec 47 38.8 31.6

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 4.7 0.1 -4.1
Feb 5.5 0.4 -4
Mar 11.9 5.8 0.8
Apr 18.6 12.1 6.4
May 24.3 17.7 11.6
Jun 28.3 22.3 16.8
Jul 30.9 25 19.6
Aug 29.3 23.4 18.1
Sep 26.2 20.2 14.8
Oct 19.6 13.9 8.7
Nov 13.1 7.7 2.9
Dec 8.3 3.8 -0.2



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Princeton are September, November, and then January. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid to late September. For example, on the week of September 17th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in early June with an average of 2 days of significant precipitation the week of June 4th.

When can you find snow in Princeton? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Princeton.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Princeton (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 19% 0 2.9
Feb 22% 0 2.4
Mar 21% 0 3.6
Apr 22% 0 3.9
May 26% 0 3.8
Jun 29% 0 4.8
Jul 26% 0 4.4
Aug 24% 0 5.3
Sep 18% 0 3.3
Oct 21% 0 3.9
Nov 19% 0 2.6
Dec 28% 0 4.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 19 0 7.4
Feb 22 0 6.1
Mar 21 0 9.1
Apr 22 0 9.9
May 26 0 9.7
Jun 29 0 12.2
Jul 26 0 11.2
Aug 24 0 13.5
Sep 18 0 8.4
Oct 21 0 9.9
Nov 19 0 6.6
Dec 28 0 12.2


Humidity and Wind

Princeton has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is April (45.4% relative humidity), and the most humid month is September (61.6%).

Wind in Princeton is usually calm. The windiest month is March, followed by April and February. March’s average wind speed of around 7.1 knots (8.2 MPH or 13.2 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early April where average top sustained speeds reach 14.6 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Princeton.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 6.2 Light breeze 12.5 Significant breeze
Feb 6.9 Light breeze 13.7 Significant breeze
Mar 7.1 Gentle breeze 13.5 Significant breeze
Apr 7 Gentle breeze 13.9 Significant breeze
May 5.6 Light breeze 11.7 Significant breeze
Jun 5.1 Light breeze 11.2 Significant breeze
Jul 4.8 Light breeze 11 Significant breeze
Aug 4.5 Light breeze 10.3 Gentle breeze
Sep 5.1 Light breeze 10.6 Significant breeze
Oct 5.6 Light breeze 11.5 Significant breeze
Nov 5.8 Light breeze 11.6 Significant breeze
Dec 6.2 Light breeze 12.4 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 49.5%
Feb 46.9%
Mar 45.5%
Apr 45.4%
May 55.4%
Jun 59.3%
Jul 57.6%
Aug 60%
Sep 61.6%
Oct 60.2%
Nov 54.6%
Dec 58.5%


Is it Safe to Travel to Princeton?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Princeton, NJ, US is July, followed by September and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Princeton in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 83 in December means 83% of the tourists vs. July.



Overall Princeton Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 82.1°F (27.8°C) and 45°F (7.2°C) with far warmer temperatures in the later months. Rain is somewhat common with 7 to 8 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 8 to 9 days of precipitation per month. June – August is the busiest season for tourism in Princeton, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 83.6°F (28.7°C) and 50.9°F (10.5°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 5 to 7 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.

Winter (December through February)

Weather is far too cold this time of year in Princeton to be enjoyable for warm weather travelers. The average high during this season is between 47.8°F (8.8°C) and 36.8°F (2.7°C). On average, it rains or snows a fair amount: 6 to 9 times per month. These times of year are the slowest with tourists.


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