Average monthly water temperature in Boston, the United States of America
On this page you find the mean water temperature over the year in Boston (Massachusetts), the United States of America. Get insights into the water temperature fluctuations and discover what they mean for visitors.
In Boston, water temperatures vary throughout the year. The warmest month is August, with an average water temperature of 20°C (68°F).
The coldest month is February, with an average temperature of 4°C (39°F). These seasonal variations make Boston a great destination for different kinds of aquatic activities.
Boston Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Boston - and find the best time to visit.
Boston 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Boston climate overview or explore weather in the United States of America.
Popular this month
Where to go in August - average daytime high across popular destinations.
Kissimmee
33°C (91°F) Orlando33°C (91°F) Miami Beach32°C (90°F) Destin32°C (90°F) New York City
29°C (84°F) Big Bear Lake
27°C (81°F) Los Angeles
24°C (75°F) San Francisco22°C (72°F) 
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