April Weather in Princeton, United States

Last updated: June 24, 2025

In April, the average temperature in Princeton, United States hovers around 9°C (49°F). Temperatures can vary significantly, with a minimum dipping to -9°C (17°F) and a maximum reaching up to 29°C (84°F). Expect about 106 mm (4.2 in) of precipitation spread over 12 days, and be prepared for high humidity levels at 82%.

April Temperature in Princeton

In April in Princeton, the average temperature is 9°C (49°F), with maximums reaching 29°C (84°F) and minimums dropping as low as -9°C (17°F). This temperature range suggests that travelers should prepare for a variety of weather conditions, from warm days to potentially chilly nights.

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

The chart illustrates April 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, April typically has an average temperature of 9°C (49°F), with highs reaching up to 29°C (84°F) and lows dropping to around -9°C (17°F).

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

April Precipitation in Princeton

In Princeton in April, the precipitation amount is 106 mm (4.2 in), occurring over a span of 12 days.

April Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Princeton, April typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Princeton

In Princeton in April, humidity is 82%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities less enjoyable and prompting travelers to seek warmth indoors or in cozy cafes.

April Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Princeton is approximately 82%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Princeton

In Princeton in April, 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 April

The chart shows the monthly maximum UV Index (UVI) for Princeton in April, 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 April, the maximum UV index in Princeton typically reaches 8, which falls under the very high exposure category.

Data source: Princeton April 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 April 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 April’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 April’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