May weather forecast and climate
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
May has the perfect weather, with warm and pleasant days, and beautiful scenic surroundings. Spring is at its peak in May, and the mercury is in a pleasant range of 49.8°F (9.9°C) and 66°F (18.9°C).
Eight and a half hours of sunshine warm up most days, and the minimal precipitation of 3.5" (88.9mm) ensures touring Boston is easy and smooth.
Expect crowds in the parks and gardens throughout Boston, since the spectacular blossoming is at its peak. The wild flowery blossoms fill Boston with lovely scents, and the air is fresh and crisp. Outdoors becomes more vibrant as activities that were bound by the winter chill take off.

What is the temperature in May in Boston?

In Boston, Massachusetts, in May, the average high-temperature is 66°F (18.9°C), and the average low-temperature is 49.8°F (9.9°C).

What is the average humidity in May in Boston?

In May, the average relative humidity in Boston, Massachusetts, is 66.7%.

How much does it rain in Boston in May?

In Boston, in May, during 12 rainfall days, 3.5" (88.6mm) of precipitation is typically accumulated.

Does it snow in Boston in May?

In May, in Boston, it doesn't snow. April is the latest month when it typically snows.

How cold is the water in May in Boston?

In Boston, in May, the average water temperature is 49.1°F (9.5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average UV index in May in Boston?

In Boston, Massachusetts, the average UV index in May is 7.
Average temperature in May - Boston, MA
  • Average high temperature in May: 66°F

The warmest month (with the highest average high temperature) is July (81.4°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in May: 49.9°F

The month with the highest average low temperature is July (65.4°F).
The coldest month (with the lowest average low temperature) is January (22.2°F).

Average humidity in May - Boston, MA
  • Average humidity in May: 66.7%

The month with the highest relative humidity is September (71.8%).
The month with the lowest relative humidity is February (62%).

Average rainfall in May - Boston, MA
  • Average rainfall in May: 3.5"

The wettest month (with the highest rainfall) is March (4.3").
The driest month (with the lowest rainfall) is February (3.3").

Average rainfall days in May - Boston, MA
  • Average rainfall days in May: 12 days

The month with the highest number of rainy days is May (12 days).
The month with the lowest number of rainy days is September (8.6 days).

Average snowfall in May - Boston, MA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (12.9").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in May - Boston, MA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (6.7 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature in May - Boston, MA
  • Average sea temperature in May: 49.2°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).

Average daylight in May / Average sunshine in May - Boston, MA
  • Average daylight in May: 14.6h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in May: 8.6h

The month with most sunshine is July (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 4.6h).

Average UV index in May - Boston, MA
  • Average UV index in May: 7

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).

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