July Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in July hovers around 23°C (74°F). Expect a temperature range where lows can dip to 9°C (49°F) and highs may reach up to 35°C (96°F). During this month, anticipate 101 mm (4.0 in) of precipitation spread over approximately 10 days, accompanied by an average humidity level of 81%.

July Temperature in Princeton

In July in Princeton, the average temperature is 23°C (74°F). Maximums can reach 35°C (96°F) and minimums can be as low as 9°C (49°F). It’s a great time to explore Princeton, so pack accordingly to enjoy a range of outdoor activities!

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

The chart illustrates July 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, July typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 9°C (49°F).

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

July Precipitation in Princeton

In Princeton in July, the precipitation amount is 101 mm (4.0 in) spread over the course of 10 days.

July Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Princeton, July typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Princeton

In Princeton in July, humidity is 81%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket draped over your skin, making travel feel a bit more sluggish and requiring plenty of water breaks to stay comfortable.

July Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Princeton is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Princeton

In Princeton in July, 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 July

The chart shows the monthly maximum UV Index (UVI) for Princeton in July, 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 July, the maximum UV index in Princeton typically reaches 9, which falls under the very high exposure category.

Data source: Princeton July 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 July 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	19 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	28 mm (1.1 inches)	90%	moderate
March Weather	0°C (32°F)	51 mm (2.0 inches)	85%	moderate
April Weather	6°C (42°F)	94 mm (3.7 inches)	84%	high
May Weather	15°C (58°F)	98 mm (3.9 inches)	78%	very high
June Weather	21°C (71°F)	75 mm (3.0 inches)	80%	very high
July Weather	23°C (74°F)	101 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	142 mm (5.6 inches)	81%	very high
September Weather	17°C (63°F)	116 mm (4.6 inches)	81%	high
October Weather	8°C (47°F)	106 mm (4.2 inches)	84%	moderate
November Weather	0°C (32°F)	33 mm (1.3 inches)	88%	moderate
December Weather	-6°C (22°F)	48 mm (1.9 inches)	84%	low