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August Weather in Princeton, United States

Last updated: June 24, 2025

In August, the average temperature in Princeton, United States hovers around 21°C (71°F). Expect a comfortable range with minimums of 7°C (45°F) and occasional highs reaching 33°C (91°F). However, be prepared for the possibility of 100 mm (3.9 in) of precipitation spread over 11 days. With an average humidity of 76%, it’s a month where you'll feel the warmth but also the moisture in the air!

August Temperature in Princeton

In August in Princeton, the average temperature is 21°C (71°F), with maximums reaching 33°C (91°F) and minimums dipping to as low as 7°C (45°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

August Weather in Princeton: Daily Temperature Highs, Lows, and Averages

The chart illustrates August 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, August typically has an average temperature of 21°C (71°F), with highs reaching up to 33°C (91°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec202134445869747064503628
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.

August Precipitation in Princeton

In Princeton in August, the precipitation amount is 100 mm (3.9 in) over the course of 11 days.

August Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Princeton, August typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec46506099117108109100891054648
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Princeton

In Princeton in August humidity is 76%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket, making traveling both refreshing and a bit exhausting, as the air clings to your skin and you often find yourself reaching for water to stay hydrated.

August Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Princeton is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Princeton

In Princeton in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Princeton.

Maximum UV Index Levels in Princeton for August

The chart shows the monthly maximum UV Index (UVI) for Princeton in August, 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 August, the maximum UV index in Princeton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101097532
Data source: Princeton August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)46 mm (1.8 inches)85%moderate
February Weather-6°C (21°F)50 mm (2.0 inches)85%moderate
March Weather1°C (34°F)60 mm (2.4 inches)85%moderate
April Weather7°C (45°F)99 mm (3.9 inches)85%very high
May Weather15°C (59°F)117 mm (4.6 inches)78%very high
June Weather21°C (70°F)108 mm (4.3 inches)80%very high
July Weather23°C (74°F)109 mm (4.3 inches)78%very high
August Weather21°C (71°F)100 mm (3.9 inches)76%very high
September Weather18°C (64°F)89 mm (3.5 inches)79%high
October Weather10°C (51°F)105 mm (4.1 inches)83%moderate
November Weather2°C (36°F)46 mm (1.8 inches)88%moderate
December Weather-2°C (28°F)48 mm (1.9 inches)81%low

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