May Weather in Williamstown, United States

Last updated: June 24, 2025

In May, the average temperature in Williamstown, United States hovers around 13°C (56°F). However, temperatures can swing from a chilly -2°C (29°F) to a warm 31°C (89°F). Be prepared for some rain, with 110 mm (4.3 in) of precipitation spread over 15 days. Don’t forget, the average humidity sits at a comfortable 76%, ensuring a refreshing atmosphere.

May Temperature in Williamstown

In May in Williamstown, the average temperature is 13°C (56°F). Maximum temperatures can reach 31°C (89°F), while minimum temperatures may drop as low as -2°C (29°F). This diverse temperature range makes Williamstown an interesting destination for travelers, offering both warm and cooler experiences.

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

The chart illustrates May temperature patterns in Williamstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamstown, May typically has an average temperature of 13°C (56°F), with highs reaching up to 31°C (89°F) and lows dropping to around -2°C (29°F).

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

May Precipitation in Williamstown

In Williamstown in May, the precipitation amount is 110 mm (4.3 in) over the course of 15 days.

May Precipitation Trends in Williamstown

The chart displays monthly precipitation patterns in Williamstown, 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 Williamstown, May typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 15 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 Williamstown

In Williamstown in May humidity is 76%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making travel a bit uncomfortable as you navigate through the heavy, moisture-laden air.

May Average Humidity in Williamstown

This chart illustrates the average monthly humidity levels in Williamstown, 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 Williamstown is approximately 76%, 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 Williamstown

In Williamstown 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 Williamstown.

Maximum UV Index Levels in Williamstown for May

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

Data source: Williamstown 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 Williamstown Compares to Other Months

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

This table compares monthly weather conditions in Williamstown, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	86 mm (3.4 inches)	89%	moderate
February Weather	-3°C (26°F)	105 mm (4.1 inches)	88%	moderate
March Weather	0°C (32°F)	94 mm (3.7 inches)	86%	high
April Weather	7°C (44°F)	136 mm (5.4 inches)	84%	very high
May Weather	13°C (56°F)	110 mm (4.3 inches)	76%	very high
June Weather	18°C (65°F)	90 mm (3.5 inches)	72%	very high
July Weather	21°C (71°F)	130 mm (5.1 inches)	66%	very high
August Weather	20°C (69°F)	103 mm (4.0 inches)	64%	very high
September Weather	17°C (62°F)	105 mm (4.1 inches)	72%	high
October Weather	10°C (51°F)	155 mm (6.1 inches)	81%	high
November Weather	2°C (37°F)	113 mm (4.5 inches)	87%	moderate
December Weather	-2°C (28°F)	115 mm (4.5 inches)	84%	low