May Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in May hovers around 12°C (53°F), with fluctuations ranging from a chilly 0°C (31°F) to a warm 33°C (91°F). Expect moderate precipitation, totaling 104 mm (4.1 in) over 11 days, and an average humidity level of 76%, creating a unique and inviting atmosphere throughout the month.

May Temperature in Princeton

In May in Princeton, the average temperature is 12°C (53°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 0°C (31°F). This variety in temperatures makes it essential for travelers to pack accordingly and be prepared for both warm days and chilly nights.

May Weather in Princeton: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Princeton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Princeton, May typically has an average temperature of 12°C (53°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (31°F).

Data source: Temperature data for Princeton generated using information from the Copernicus Climate Change Service.

May Precipitation in Princeton

In Princeton in May, the precipitation amount is 104 mm (4.1 in) over the course of 11 days.

May Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Princeton, May typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Princeton

In Princeton in May humidity is 76%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that settles into your bones, making outdoor activities a bit uncomfortable and necessitating layers to stay warm while exploring.

May Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Princeton is approximately 76%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Princeton

In Princeton in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Princeton.

Maximum UV Index Levels in Princeton for May

The chart shows the monthly maximum UV Index (UVI) for Princeton in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Princeton typically reaches 9, which falls under the very high exposure category.

Data source: Princeton May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Princeton Compares to Other Months

Weather in Princeton varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Princeton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Princeton, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	96 mm (3.8 inches)	88%	low
February Weather	-5°C (23°F)	88 mm (3.5 inches)	88%	moderate
March Weather	-1°C (30°F)	71 mm (2.8 inches)	85%	moderate
April Weather	6°C (42°F)	119 mm (4.7 inches)	81%	high
May Weather	12°C (53°F)	104 mm (4.1 inches)	76%	very high
June Weather	17°C (63°F)	91 mm (3.6 inches)	74%	very high
July Weather	20°C (69°F)	91 mm (3.6 inches)	74%	very high
August Weather	20°C (69°F)	77 mm (3.0 inches)	74%	very high
September Weather	16°C (61°F)	87 mm (3.4 inches)	77%	high
October Weather	10°C (50°F)	110 mm (4.3 inches)	82%	moderate
November Weather	3°C (37°F)	128 mm (5.0 inches)	85%	moderate
December Weather	-3°C (26°F)	120 mm (4.7 inches)	84%	low