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April Weather in Princeton, United States

Last updated: June 24, 2025

In April, the average temperature in Princeton, United States hovers around 10°C (51°F), offering a mix of cool and mild days. Expect minimum temperatures to dip as low as -9°C (16°F), while sunnier spells can see highs of 29°C (85°F). Prepare for 78 mm (3.1 in) of precipitation over approximately 10 days, paired with an average humidity of 77%. 🌦️

April Temperature in Princeton

In April in Princeton, the average temperature is 10°C (51°F). Maximum temperatures can reach as high as 29°C (85°F), while the minimum can drop to a chilly -9°C (16°F). Be prepared for a wide range of temperatures to make the most of your travel experience!

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 10°C (51°F), with highs reaching up to 29°C (85°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec252842516475787569544033
Data source: Temperature data for Princeton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Princeton

In Princeton in April, the precipitation amount is 78 mm (3.1 in) over the course of 10 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 78 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec484410378158124106881191545534
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Princeton

In Princeton in April humidity is 77%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that can make outdoor activities somewhat uncomfortable, causing clothes to cling to your skin and breathing to feel heavier, which may deter longer sightseeing adventures.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111198643
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.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)48 mm (1.9 inches)78%moderate
February Weather-2°C (28°F)44 mm (1.7 inches)80%moderate
March Weather6°C (42°F)103 mm (4.0 inches)77%high
April Weather10°C (51°F)78 mm (3.1 inches)77%very high
May Weather18°C (64°F)158 mm (6.2 inches)77%very high
June Weather24°C (76°F)124 mm (4.9 inches)81%extreme
July Weather26°C (78°F)106 mm (4.2 inches)81%extreme
August Weather24°C (75°F)88 mm (3.5 inches)77%very high
September Weather21°C (70°F)119 mm (4.7 inches)73%very high
October Weather12°C (54°F)154 mm (6.1 inches)75%high
November Weather5°C (40°F)55 mm (2.2 inches)85%moderate
December Weather1°C (34°F)34 mm (1.4 inches)83%moderate

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