Boston
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast
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May weather forecast and Climate
Boston, MA

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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.
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  • The 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).

  • The 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).

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  • The 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%).

  • The 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").

  • The 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).

  • The 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").

  • The 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).

  • The 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).

  • The average daylight in May: 15h

Months with the longest days are May, June and July (Average daylight: 15h).
Months with shortest days are January and December (Average daylight: 9h).

  • The 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).

  • The 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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