May Weather in Hackettstown, United States

Last updated: June 24, 2025

In May, the average temperature in Hackettstown, United States hovers around 16°C (61°F). However, temperatures can vary widely, with a minimum of 0°C (32°F) and a maximum reaching up to 33°C (92°F). Expect precipitation of approximately 133 mm (5.3 in) spread over 13 days, contributing to an average humidity of about 69%. Prepare accordingly!

May Temperature in Hackettstown

In May in Hackettstown, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 0°C (32°F). Be prepared for a wide range of temperatures when traveling during this time.

May Weather in Hackettstown: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Hackettstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hackettstown, May typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (92°F) and lows dropping to around 0°C (32°F).

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

May Precipitation in Hackettstown

In Hackettstown in May, the precipitation amount is 133 mm (5.3 in) over the course of 13 days.

May Precipitation Trends in Hackettstown

The chart displays monthly precipitation patterns in Hackettstown, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Hackettstown, May typically receives around 133 mm (5.3 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Hackettstown

In Hackettstown in May, humidity is 69%. With an average temperature of 16°C (61°F), this humidity feels like a mild, humid embrace, making travel enjoyable yet requiring a light layer for comfort while exploring.

May Average Humidity in Hackettstown

This chart illustrates the average monthly humidity levels in Hackettstown, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Hackettstown is approximately 69%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Hackettstown

In Hackettstown in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Hackettstown.

Maximum UV Index Levels in Hackettstown for May

The chart shows the monthly maximum UV Index (UVI) for Hackettstown in May, 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 May, the maximum UV index in Hackettstown typically reaches 10, which falls under the very high exposure category.

Data source: Hackettstown May 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 May Weather in Hackettstown Compares to Other Months

Weather in Hackettstown varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Hackettstown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hackettstown, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	71 mm (2.8 inches)	84%	moderate
February Weather	2°C (35°F)	103 mm (4.1 inches)	82%	moderate
March Weather	5°C (41°F)	102 mm (4.0 inches)	81%	high
April Weather	11°C (51°F)	109 mm (4.3 inches)	78%	very high
May Weather	16°C (61°F)	133 mm (5.3 inches)	69%	very high
June Weather	21°C (71°F)	102 mm (4.0 inches)	69%	very high
July Weather	25°C (77°F)	134 mm (5.3 inches)	62%	very high
August Weather	23°C (74°F)	138 mm (5.4 inches)	65%	very high
September Weather	20°C (68°F)	102 mm (4.0 inches)	68%	very high
October Weather	14°C (58°F)	134 mm (5.3 inches)	74%	high
November Weather	6°C (44°F)	87 mm (3.4 inches)	82%	moderate
December Weather	2°C (36°F)	109 mm (4.3 inches)	80%	low