May Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in May is a comfortable 15°C (58°F). However, prepare for a range as the minimum can drop to -1°C (30°F) and the maximum can soar up to 35°C (96°F). Expect 98 mm (3.9 in) of precipitation spread over about 11 days, contributing to an average humidity of 78%. Stay ready for a mix of weather and enjoy your time!

May Temperature in Princeton

In May in Princeton, the average temperature is 15°C (58°F). Maximums can reach 35°C (96°F) and minimums can be as low as -1°C (30°F). It's a good idea to pack layers to accommodate the wide temperature range during your travels.

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 15°C (58°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (30°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 total precipitation amount is 98 mm (3.9 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 98 mm (3.9 inches) of precipitation spread over approximately 11 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Princeton

In Princeton in May, humidity is 78%. With an average temperature of 15°C (58°F), this humidity feels like a warm and sticky embrace, making outdoor activities a bit uncomfortable and prompting the need for frequent hydration and breaks in the shade.

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 78%, 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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, 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	-10°C (15°F)	19 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	28 mm (1.1 inches)	90%	moderate
March Weather	0°C (32°F)	51 mm (2.0 inches)	85%	moderate
April Weather	6°C (42°F)	94 mm (3.7 inches)	84%	high
May Weather	15°C (58°F)	98 mm (3.9 inches)	78%	very high
June Weather	21°C (71°F)	75 mm (3.0 inches)	80%	very high
July Weather	23°C (74°F)	101 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	142 mm (5.6 inches)	81%	very high
September Weather	17°C (63°F)	116 mm (4.6 inches)	81%	high
October Weather	8°C (47°F)	106 mm (4.2 inches)	84%	moderate
November Weather	0°C (32°F)	33 mm (1.3 inches)	88%	moderate
December Weather	-6°C (22°F)	48 mm (1.9 inches)	84%	low