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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 23°C (73°F), offering a comfortable climate for both locals and visitors. However, temperatures can vary significantly, with minimums dipping to 8°C (46°F) and highs soaring up to 35°C (95°F). Be prepared for some rain, as 180 mm (7.1 in) of precipitation can be expected over 12 days, accompanied by an average humidity level of 81%.

May Temperature in Princeton

In May in Princeton, the average temperature is 23°C (73°F), with maximums reaching 35°C (95°F) and minimums dropping to 8°C (46°F). This range makes Princeton an ideal destination for travelers seeking pleasant weather and a variety of outdoor activities.

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 23°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec464859647381848478675550
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 180 mm (7.1 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 180 mm (7.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec651041341441801015896981575873
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 81%. With an average temperature of 23°C (73°F), this humidity feels like a heavy blanket wrapping around you, making every step feel more laborious while traveling and causing you to constantly seek out shade or a cool breeze for relief.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%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 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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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 Weather8°C (46°F)65 mm (2.6 inches)80%moderate
February Weather9°C (48°F)104 mm (4.1 inches)79%high
March Weather15°C (59°F)134 mm (5.3 inches)78%very high
April Weather18°C (64°F)144 mm (5.7 inches)78%very high
May Weather23°C (73°F)180 mm (7.1 inches)81%extreme
June Weather27°C (81°F)100 mm (4.0 inches)78%extreme
July Weather29°C (84°F)58 mm (2.3 inches)73%extreme
August Weather29°C (84°F)96 mm (3.8 inches)66%extreme
September Weather26°C (79°F)98 mm (3.8 inches)65%very high
October Weather19°C (67°F)157 mm (6.2 inches)72%very high
November Weather13°C (56°F)58 mm (2.3 inches)82%high
December Weather10°C (51°F)73 mm (2.9 inches)87%moderate

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