May Weather in Princeton, United States

Last updated: June 24, 2025

The average temperature in Princeton, United States during May is a pleasant 14°C (58°F). Visitors can expect temperatures to range from a minimum of 0°C (33°F) to a maximum of 33°C (92°F). Rainfall is not uncommon, with an average precipitation amount of 92 mm (3.6 in) spread over approximately 12 days. Furthermore, the average humidity hovers around 72%, creating a unique and inviting atmosphere.

May Temperature in Princeton

In May in Princeton, the average temperature is 14°C (58°F). Maximums can reach 33°C (92°F), and minimums can drop as low as 0°C (33°F). This diverse temperature range makes Princeton an ideal destination for travelers looking for a blend of warm and cool weather experiences.

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 14°C (58°F), with highs reaching up to 33°C (92°F) and lows dropping to around 0°C (33°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 92 mm (3.6 in) over the course of 12 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 92 mm (3.6 inches) of precipitation spread over approximately 12 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 72%. With an average temperature of 14°C (58°F), this humidity feels like a damp blanket wrapping around you, making walking and exploring slightly uncomfortable and requiring frequent breaks for hydration.

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 72%, 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	-3°C (27°F)	76 mm (3.0 inches)	86%	moderate
February Weather	-1°C (30°F)	90 mm (3.6 inches)	84%	moderate
March Weather	2°C (35°F)	86 mm (3.4 inches)	82%	high
April Weather	8°C (47°F)	131 mm (5.2 inches)	80%	very high
May Weather	14°C (58°F)	92 mm (3.6 inches)	72%	very high
June Weather	20°C (68°F)	89 mm (3.5 inches)	72%	very high
July Weather	23°C (73°F)	150 mm (5.9 inches)	67%	very high
August Weather	22°C (72°F)	94 mm (3.7 inches)	66%	very high
September Weather	18°C (65°F)	89 mm (3.5 inches)	71%	very high
October Weather	12°C (54°F)	136 mm (5.4 inches)	78%	high
November Weather	4°C (40°F)	102 mm (4.0 inches)	84%	moderate
December Weather	-1°C (31°F)	126 mm (5.0 inches)	81%	low