May Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in May hovers around 21°C (69°F). Throughout the month, temperatures can range from a cool 7°C (45°F) to a warm 32°C (90°F). Expect about 118 mm (4.7 in) of precipitation spread across 13 days, contributing to an average humidity of 82%. 🌦️ Enjoy the balance of warmth and refreshment this month brings!

May Temperature in Princeton

In May in Princeton, the average temperature is 21°C (69°F). The maximum can reach 32°C (90°F) and the minimum can be as low as 7°C (45°F). This climate is perfect for travelers looking to enjoy mild weather while exploring the area.

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 21°C (69°F), with highs reaching up to 32°C (90°F) and lows dropping to around 7°C (45°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 118 mm (4.7 in) over the course of 13 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 118 mm (4.7 inches) of precipitation spread over approximately 13 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 82%. With an average temperature of 21°C (69°F), this humidity feels like a sweltering embrace, making outdoor activities feel more strenuous and prompting travelers to seek shade and cooling breezes.

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 82%, 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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme 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 (38°F)	97 mm (3.8 inches)	86%	moderate
February Weather	5°C (42°F)	150 mm (5.9 inches)	84%	high
March Weather	10°C (51°F)	135 mm (5.3 inches)	84%	high
April Weather	14°C (58°F)	138 mm (5.4 inches)	80%	very high
May Weather	21°C (69°F)	118 mm (4.7 inches)	82%	extreme
June Weather	25°C (77°F)	118 mm (4.6 inches)	83%	extreme
July Weather	27°C (81°F)	106 mm (4.2 inches)	79%	very high
August Weather	26°C (78°F)	104 mm (4.1 inches)	76%	very high
September Weather	23°C (74°F)	93 mm (3.7 inches)	75%	very high
October Weather	17°C (63°F)	108 mm (4.3 inches)	74%	high
November Weather	9°C (48°F)	96 mm (3.8 inches)	85%	moderate
December Weather	6°C (44°F)	119 mm (4.7 inches)	88%	moderate