August Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in August is a pleasant 24°C (75°F). However, be prepared for a range, with minimums dipping to 11°C (53°F) and maximums soaring to 37°C (99°F). Expect about 88 mm (3.5 in) of precipitation over 9 days, accompanied by an average humidity of 77%. Whether you're exploring or relaxing, pack accordingly!

August Temperature in Princeton

In August in Princeton, the average temperature is 24°C (75°F), with maximums reaching 37°C (99°F) and minimums dipping as low as 11°C (53°F). Be sure to pack both light clothing and a jacket for your travels as the weather can vary significantly throughout the day.

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 24°C (75°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (53°F).

Data source: Temperature data for Princeton generated using information from the Copernicus Climate Change Service.

August Precipitation in Princeton

In Princeton in August, the precipitation amount is 88 mm (3.5 in) over the course of 9 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 88 mm (3.5 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Princeton

In Princeton in August humidity is 77%. With an average temperature of 24°C (75°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel stifling and may require frequent breaks to stay hydrated while exploring.

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 77%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (26°F)	48 mm (1.9 inches)	78%	moderate
February Weather	-2°C (28°F)	44 mm (1.7 inches)	80%	moderate
March Weather	6°C (42°F)	103 mm (4.0 inches)	77%	high
April Weather	10°C (51°F)	78 mm (3.1 inches)	77%	very high
May Weather	18°C (64°F)	158 mm (6.2 inches)	77%	very high
June Weather	24°C (76°F)	124 mm (4.9 inches)	81%	extreme
July Weather	26°C (78°F)	106 mm (4.2 inches)	81%	extreme
August Weather	24°C (75°F)	88 mm (3.5 inches)	77%	very high
September Weather	21°C (70°F)	119 mm (4.7 inches)	73%	very high
October Weather	12°C (54°F)	154 mm (6.1 inches)	75%	high
November Weather	5°C (40°F)	55 mm (2.2 inches)	85%	moderate
December Weather	1°C (34°F)	34 mm (1.4 inches)	83%	moderate