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What is the Weather in Boston in May?

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This post is an overview of the May weather in Boston, with tips on how to dress and things to do to help make the most of your trip. We also list some of the best things to do in May in Boston, updated for 2020.


May is an excellent time to visit Boston as daytime high temperatures will be warming from the low-60s F (16 to 17 C) early in the month into the low-70s F (21 to 22 C) by the month’s end.

A couple of the warmer afternoons, later in the month can reach up into the mid-80s F (28 to 29 C). The highest temperature recorded in Boston during May was 95 F (35 C).

 Average Temps in Boston in May 

Late night and early morning low temperatures are mostly in the mid-40s F (7 to 8 C) early in May but warm to the mid-50’s F (12 to 13 C) by the end of the month.

A few of the more chilly mornings can dip down to near 40 F (4 to 5 C). The record low temperature for Boston during May was 34 F (1.1 C).


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During May skies will be clear or at least partly sunny on about 16 days so there should be ample time to explore this city.

About 8-10 days will record at least 0.04 inches (1 mm) or more of rain. Snow does not normally occur during May in Boston.


How Much Sun and Rain in Boston in May

Daylight hours increase during the month from a little over 14 hours on May 1st to just over 15 hours on the 31st.


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May is mostly Spring-like with a few summer-like days, especially during the second half of the month.

You should consider at least one light-weight jacket and/or windbreaker for the cooler days and evenings while a sweater might be all you need for most days.

Some summer attire will come in handy for the few warmer days late in the month. Bring an umbrella for the rainy days and don’t forget some good walking shoes.


What to Wear in May in Boston


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Below we list some of the highlights of events and activties that take place in Boston dring May, 2020.

For a fuller list of events this month, read our post on what to do in Boston in May, which includes free things to do, night and family-friendly activities and attractions.

Check out our definitive post on the best things to do in Boston year-round.

And if you are planning on visiting many of Boston’s top attractions, then you should consider a tourist discount pass as you could save up to 50% of retail ticket prices to tours, attractions, and restaurants.


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  • Attend the Free MayFair at Harvard Square
  • Go to the Boston Calling Music Festival
  • Enjoy ArtWeek Boston
  • Commemorate Memorial Day at the Garden of Flags
  • Take a Free Walking Tour 
  • Visit Martha's Vineyard on a Day Trip
  • Catch a Red Sox Game
  • Celebrate Mother's Day on a Brunch Cruise
  • Go to the Nantucket Wine Festival

Be sure to check out all the top things to do in May in our main post.


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About The Author

Brian Burgess

Brian was born in Cambridge and has been living in the Boston area all his life. He is a graduate of Boston's Emerson College with a degree in communications with a journalism/history focus. He has been leading tours for Free Tours By Foot Boston since it was started in the city of Boston in 2012, and enjoys sharing his knowledge of Boston's rich history with not only the guests on his tours, but with everyone he meets.
Updated: September 25th, 2021
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