May Weather in Somerville, United States

Last updated: June 24, 2025

The average temperature in Somerville, United States during May is a mild 12°C (55°F). However, temperatures can vary significantly, with a minimum of 1°C (34°F) and a maximum reaching up to 33°C (92°F). Expect 80 mm (3.2 in) of precipitation spread over about 11 days, and enjoy a relatively high average humidity of 76%.

May Temperature in Somerville

In May in Somerville, the average temperature is 12°C (55°F). Maximum temperatures can reach as high as 33°C (92°F), while the minimum can drop to a chilly 1°C (34°F). Be prepared for a wide range of weather conditions, making it ideal for travelers who enjoy both warm days and cool evenings.

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

The chart illustrates May temperature patterns in Somerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somerville, May typically has an average temperature of 12°C (55°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (34°F).

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

May Precipitation in Somerville

In Somerville in May, the precipitation amount is 80 mm (3.2 in) spread over 11 days.

May Precipitation Trends in Somerville

The chart displays monthly precipitation patterns in Somerville, 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 Somerville, May typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 11 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 Somerville

In Somerville in May humidity is 76%. With an average temperature of 12°C (55°F), this humidity feels like a damp embrace, making traveling somewhat uncomfortable as the air clings to your skin and can leave you feeling cooler than expected.

May Average Humidity in Somerville

This chart illustrates the average monthly humidity levels in Somerville, 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 Somerville 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 Somerville

In Somerville in May, 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 Somerville.

Maximum UV Index Levels in Somerville for May

The chart shows the monthly maximum UV Index (UVI) for Somerville 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 Somerville typically reaches 9, which falls under the very high exposure category.

Data source: Somerville 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 Somerville Compares to Other Months

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

This table compares monthly weather conditions in Somerville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	88 mm (3.5 inches)	88%	low
February Weather	-3°C (26°F)	86 mm (3.4 inches)	88%	moderate
March Weather	0°C (33°F)	72 mm (2.8 inches)	85%	moderate
April Weather	7°C (44°F)	124 mm (4.9 inches)	81%	high
May Weather	12°C (55°F)	80 mm (3.2 inches)	76%	very high
June Weather	18°C (65°F)	64 mm (2.5 inches)	74%	very high
July Weather	21°C (71°F)	105 mm (4.1 inches)	74%	very high
August Weather	21°C (70°F)	77 mm (3.0 inches)	74%	very high
September Weather	17°C (63°F)	73 mm (2.9 inches)	77%	high
October Weather	11°C (52°F)	129 mm (5.1 inches)	82%	moderate
November Weather	3°C (38°F)	109 mm (4.3 inches)	85%	moderate
December Weather	-2°C (28°F)	121 mm (4.8 inches)	84%	low