October Weather in Princeton, United States

Last updated: June 24, 2025

In October, the average temperature in Princeton, United States hovers around 12°C (54°F), with minimums dropping to -5°C (24°F) and maximums peaking at 31°C (89°F). Visitors can expect 112 mm (4.4 in) of precipitation spread over 12 days, contributing to an average humidity level of 78%. Whether you're exploring or relaxing, be prepared for a range of weather conditions!

October Temperature in Princeton

In October in Princeton, the average temperature is 12°C (54°F). The maximum can reach 31°C (89°F), while the minimum can drop as low as -5°C (24°F). Pack a variety of clothing to ensure you're comfortable whether you're enjoying warm days or chilly nights.

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

The chart illustrates October 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, October typically has an average temperature of 12°C (54°F), with highs reaching up to 31°C (89°F) and lows dropping to around -5°C (24°F).

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

October Precipitation in Princeton

In Princeton in October, the total precipitation amount is 112 mm (4.4 in), falling over the course of 12 days.

October Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Princeton, October typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Princeton

In Princeton in October humidity is 78%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill settling in, making travel a bit uncomfortable as the air clings to your skin, leaving you feeling cooler than the thermometer suggests.

October Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Princeton is approximately 78%, offering insight into how humid the weather typically is during this month.

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

October UV Index in Princeton

In Princeton in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Princeton, you can refer to this Hourly UV Index in Princeton.

Maximum UV Index Levels in Princeton for October

The chart shows the monthly maximum UV Index (UVI) for Princeton in October, 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 October, the maximum UV index in Princeton typically reaches 6, which falls under the high exposure category.

Data source: Princeton October 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 October 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 October’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 October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	55 mm (2.2 inches)	81%	moderate
February Weather	-4°C (26°F)	60 mm (2.4 inches)	81%	moderate
March Weather	4°C (40°F)	88 mm (3.5 inches)	81%	high
April Weather	9°C (49°F)	106 mm (4.2 inches)	82%	very high
May Weather	17°C (62°F)	148 mm (5.8 inches)	78%	very high
June Weather	23°C (73°F)	134 mm (5.3 inches)	81%	extreme
July Weather	25°C (77°F)	85 mm (3.4 inches)	79%	very high
August Weather	23°C (74°F)	81 mm (3.2 inches)	77%	very high
September Weather	20°C (68°F)	117 mm (4.6 inches)	78%	very high
October Weather	12°C (54°F)	112 mm (4.4 inches)	78%	high
November Weather	4°C (39°F)	48 mm (1.9 inches)	87%	moderate
December Weather	0°C (32°F)	48 mm (1.9 inches)	84%	low