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May Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature for May hovers around 20°C (69°F). While you may enjoy pleasant days, expect temperatures to fluctuate between a chilly 2°C (36°F) and a warm 33°C (92°F). With an average precipitation of 131 mm (5.2 in) spread over 14 days, and humidity levels peaking at 80%, it's wise to be prepared for some damp days ahead!

May Temperature in Princeton

In May in Princeton, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (92°F) and minimums can drop as low as 2°C (36°F). This variance makes it essential for travelers to pack accordingly, ensuring they are prepared for both warm days and cooler 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 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec353848566877807773614541
Data source: Temperature data for Princeton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Princeton

In Princeton in May, the precipitation amount is 131 mm (5.2 in) spread over the course of 14 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 131 mm (5.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec9511914611813112473877711193102
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Princeton

In Princeton in May, humidity is 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3571010111099743
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.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)95 mm (3.7 inches)84%moderate
February Weather3°C (38°F)119 mm (4.7 inches)82%moderate
March Weather9°C (48°F)146 mm (5.7 inches)84%high
April Weather14°C (57°F)118 mm (4.6 inches)83%very high
May Weather20°C (69°F)131 mm (5.2 inches)80%very high
June Weather25°C (77°F)124 mm (4.9 inches)83%extreme
July Weather27°C (80°F)73 mm (2.9 inches)82%very high
August Weather25°C (78°F)87 mm (3.4 inches)82%very high
September Weather23°C (73°F)77 mm (3.0 inches)79%very high
October Weather16°C (61°F)111 mm (4.4 inches)79%high
November Weather7°C (45°F)92 mm (3.6 inches)88%moderate
December Weather5°C (41°F)102 mm (4.0 inches)87%moderate

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