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What is the Weather in Boston in August?

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This post is an overview of the August weather in Boston, with tips on how to dress and things to do to help make the most of your trip. 




August in Boston features mostly warm afternoons and early evenings with comfortable late evenings and early mornings.

Afternoon high temperatures tend to be in the lower 80s F (27-28 C) early in the month falling into the mid to upper 70s F (24-26 C) near the end of the month.

A few of the warmer afternoons can reach up into the lower 90s F (32-33 C) with 2-3 days likely reaching at least 90 F (about 32 C).

The all-time record high temperature in Boston during August is 102 F (38.9 C).

  Average Temps in August in Boston

Late evenings and early morning temperatures tend to be in the mid to upper 60s F (19-20 C) early in August but fall into the mid-lower 60s F (17-18 C) towards the end of the month.

A few of the cooler mornings near the end of the month can see temperatures dip down into the mid-50s F (12-13 C).

The all-time record low temperature for Boston during August is 47 F (8.3 C).

August days can range from humid to comfortable so expect about 7-12 days, on average, being humid or muggy while 10-16 days will likely be comfortable to dry.

It is more likely to encounter a humid day early in the month and less likely near the end of the month.

In short, August is the best month of the year to take a free walking tour.




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About 18 days, on average, in August will see either sunny or at least partly sunny skies.

Some rain will fall on about 9-10 days this month; however, significant rainfalls of at least 0.5 inches (about 13 mm) only occur on 2 days.


How much rain in August in Boston


You can expect about 14.5 hours of daylight early in August, falling to a little over 13 hours by the end of the month so August is a good month to explore this great city.


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Summer weather prevails this month so bring the appropriate summer gear which will do well for most days.

A few of the cooler evenings or mornings, might require a sweater or a windbreaker and don’t forget some good walking shoes.


What to wear in Boston in August


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Below the video, we list our top 10 things to do this month.

Be sure to read our full post on what to do in Boston in August, which includes free things to do, night and family-friendly activities and attractions.

You should also check out our definitive post on the best things to do in Boston.

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.



Some of the fun activities we talk about include: 


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Fred Pickhardt
Ocean Weather Services


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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