July Weather in Princeton, United States

Last updated: June 24, 2025

In Princeton, United States, the average temperature in July reaches a warm 29°C (84°F). Expect a minimum of 18°C (65°F) and a sweltering maximum of 42°C (107°F). With 58 mm (2.3 in) of precipitation spread over 8 days, the average humidity levels sit at a comfortable 73%. Prepare for a mix of sunny days and occasional rain!

July Temperature in Princeton

In July in Princeton, the average temperature is 29°C (84°F). Maximums can reach 42°C (107°F), and minimums can be as low as 18°C (65°F). This warm climate makes Princeton an ideal destination for sun-seekers and outdoor enthusiasts during this time of year.

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 29°C (84°F), with highs reaching up to 42°C (107°F) and lows dropping to around 18°C (65°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 58 mm (2.3 in) over a span of 8 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 58 mm (2.3 inches) of precipitation spread over approximately 8 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 73%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable as you sweat and seek shade, yet still inviting you to explore the vibrant local culture and activities.

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 73%, 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 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 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 11, which falls under the extreme 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	8°C (46°F)	65 mm (2.6 inches)	80%	moderate
February Weather	9°C (48°F)	104 mm (4.1 inches)	79%	high
March Weather	15°C (59°F)	134 mm (5.3 inches)	78%	very high
April Weather	18°C (64°F)	144 mm (5.7 inches)	78%	very high
May Weather	23°C (73°F)	180 mm (7.1 inches)	81%	extreme
June Weather	27°C (81°F)	100 mm (4.0 inches)	78%	extreme
July Weather	29°C (84°F)	58 mm (2.3 inches)	73%	extreme
August Weather	29°C (84°F)	96 mm (3.8 inches)	66%	extreme
September Weather	26°C (79°F)	98 mm (3.8 inches)	65%	very high
October Weather	19°C (67°F)	157 mm (6.2 inches)	72%	very high
November Weather	13°C (56°F)	58 mm (2.3 inches)	82%	high
December Weather	10°C (51°F)	73 mm (2.9 inches)	87%	moderate