July Weather in Princeton, United States

Last updated: June 24, 2025

In July, the average temperature in Princeton, United States hovers around a warm 27°C (81°F). Visitors can expect temperatures to range from a comfortable 15°C (60°F) at night to a sizzling 36°C (98°F) during the day. Be prepared for a tropical climate, as the region receives an average of 124 mm (4.9 in) of precipitation over 14 days, coupled with a humidity level reaching 81%.

July Temperature in Princeton

In July in Princeton, the average temperature is 27°C (81°F). Maximum temperatures can reach 36°C (98°F), while the minimum can drop to as low as 15°C (60°F). This pleasant climate makes Princeton an ideal destination for travelers seeking both warm days and cooler evenings.

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 27°C (81°F), with highs reaching up to 36°C (98°F) and lows dropping to around 15°C (60°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 124 mm (4.9 in) over a span of 14 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 124 mm (4.9 inches) of precipitation spread over approximately 14 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in Princeton

In Princeton in July humidity is 81%. With an average temperature of 27°C (81°F), this humidity feels like a warm, heavy blanket enveloping you, making travel quite uncomfortable as it can quickly drain your energy and require frequent hydration breaks.

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 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	7°C (45°F)	92 mm (3.6 inches)	85%	moderate
February Weather	10°C (50°F)	92 mm (3.6 inches)	82%	high
March Weather	12°C (54°F)	73 mm (2.9 inches)	81%	very high
April Weather	17°C (63°F)	106 mm (4.2 inches)	80%	very high
May Weather	22°C (72°F)	118 mm (4.7 inches)	81%	very high
June Weather	25°C (77°F)	125 mm (4.9 inches)	81%	extreme
July Weather	27°C (81°F)	124 mm (4.9 inches)	81%	extreme
August Weather	26°C (79°F)	158 mm (6.2 inches)	80%	very high
September Weather	24°C (75°F)	134 mm (5.3 inches)	79%	very high
October Weather	19°C (66°F)	68 mm (2.7 inches)	80%	very high
November Weather	11°C (53°F)	84 mm (3.3 inches)	85%	moderate
December Weather	9°C (48°F)	109 mm (4.3 inches)	86%	moderate