August Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in August hovers around 20°C (69°F), creating a pleasant atmosphere for outdoor activities. Expect minimum temperatures to dip down to 7°C (45°F) and maximum highs reaching up to 33°C (92°F). Be prepared for some rain, as the area typically sees around 77 mm (3.0 in) of precipitation spread over 11 days. With an average humidity of 74%, this month promises a warm yet refreshing climate.

August Temperature in Princeton

In August in Princeton, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 7°C (45°F). This range makes Princeton a pleasant destination for travelers looking to enjoy mild weather with some variety in temperature.

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 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 7°C (45°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 77 mm (3.0 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 77 mm (3.0 inches) of precipitation spread over approximately 11 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 74%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities a bit sticky and requiring frequent breaks for hydration, but with the right pacing, you can still enjoy the sights and sounds of your surroundings.

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 74%, 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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, 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	-6°C (21°F)	96 mm (3.8 inches)	88%	low
February Weather	-5°C (23°F)	88 mm (3.5 inches)	88%	moderate
March Weather	-1°C (30°F)	71 mm (2.8 inches)	85%	moderate
April Weather	6°C (42°F)	119 mm (4.7 inches)	81%	high
May Weather	12°C (53°F)	104 mm (4.1 inches)	76%	very high
June Weather	17°C (63°F)	91 mm (3.6 inches)	74%	very high
July Weather	20°C (69°F)	91 mm (3.6 inches)	74%	very high
August Weather	20°C (69°F)	77 mm (3.0 inches)	74%	very high
September Weather	16°C (61°F)	87 mm (3.4 inches)	77%	high
October Weather	10°C (50°F)	110 mm (4.3 inches)	82%	moderate
November Weather	3°C (37°F)	128 mm (5.0 inches)	85%	moderate
December Weather	-3°C (26°F)	120 mm (4.7 inches)	84%	low