May Weather in Somerville, United States

Last updated: June 24, 2025

In May, the average temperature in Somerville, United States is a pleasant 25°C (77°F). However, be prepared for a range that can dip to a minimum of 10°C (51°F) and soar up to a maximum of 37°C (99°F). Rainfall is also a factor, with an average of 166 mm (6.5 in) spread over 13 days. Coupled with an average humidity level of 81%, it’s essential to stay comfortable and prepared for the varying conditions!

May Temperature in Somerville

In May in Somerville, the average temperature is 25°C (77°F). Maximum temperatures can reach up to 37°C (99°F), while the minimum can drop as low as 10°C (51°F). Overall, it's a great time to visit Somerville if you enjoy warm weather with a refreshing cooler breeze in the 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 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 10°C (51°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 166 mm (6.5 in) over the span of 13 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 166 mm (6.5 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 Somerville

In Somerville in May, humidity is 81%. With an average temperature of 25°C (77°F), this humidity feels like walking through a warm, thick blanket, making traveling quite challenging as you may feel sticky and sluggish, requiring frequent breaks to stay refreshed and hydrated.

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 81%, 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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme 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	12°C (53°F)	70 mm (2.8 inches)	79%	moderate
February Weather	13°C (55°F)	81 mm (3.2 inches)	80%	very high
March Weather	18°C (65°F)	69 mm (2.7 inches)	78%	very high
April Weather	20°C (69°F)	111 mm (4.4 inches)	79%	extreme
May Weather	25°C (77°F)	166 mm (6.5 inches)	81%	extreme
June Weather	28°C (83°F)	118 mm (4.7 inches)	77%	extreme
July Weather	29°C (85°F)	96 mm (3.8 inches)	71%	extreme
August Weather	30°C (86°F)	120 mm (4.7 inches)	67%	extreme
September Weather	27°C (81°F)	125 mm (4.9 inches)	69%	extreme
October Weather	22°C (72°F)	95 mm (3.7 inches)	73%	very high
November Weather	16°C (61°F)	72 mm (2.8 inches)	82%	high
December Weather	13°C (56°F)	103 mm (4.0 inches)	87%	moderate