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May Weather in Princeton, United States

Last updated: June 24, 2025

In May, the average temperature in Princeton, United States hovers around 17°C (62°F), offering a pleasant climate. However, temperatures can fluctuate dramatically, with a minimum of -2°C (29°F) and a maximum of 30°C (87°F). Expect 133 mm (5.2 in) of precipitation spread over approximately 15 days, and prepare for a relatively high average humidity of 83%, making the air feel quite humid.

May Temperature in Princeton

In May in Princeton, the average temperature is 17°C (62°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as -2°C (29°F). This range makes it important for travelers to pack for both warm and cool conditions to fully enjoy their visit.

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 17°C (62°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec344045536268727066574339
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 total precipitation amount is 133 mm (5.2 in) spread over a duration of 15 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 133 mm (5.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec77124100120133119781091091157296
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Princeton

In Princeton in May, humidity is 83%. With an average temperature of 17°C (62°F), this humidity feels like traveling through a thick blanket of warmth, making every step feel heavy and inviting frequent breaks to cool down and hydrate.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010753
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 (34°F)77 mm (3.0 inches)87%moderate
February Weather4°C (40°F)124 mm (4.9 inches)87%high
March Weather7°C (45°F)100 mm (3.9 inches)86%very high
April Weather11°C (53°F)120 mm (4.7 inches)84%very high
May Weather17°C (62°F)133 mm (5.2 inches)83%extreme
June Weather20°C (68°F)119 mm (4.7 inches)83%extreme
July Weather22°C (72°F)78 mm (3.1 inches)79%extreme
August Weather21°C (70°F)109 mm (4.3 inches)66%very high
September Weather19°C (66°F)109 mm (4.3 inches)68%very high
October Weather14°C (57°F)115 mm (4.5 inches)78%high
November Weather6°C (43°F)72 mm (2.8 inches)89%moderate
December Weather4°C (39°F)96 mm (3.8 inches)86%moderate

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