Sea Temperature in Boston in August

© Jason Parry

Complete information on the sea temperature range in the Atlantic Ocean in Boston in August. Historical daily data. Climate details for August. Tips on swimming conditions and beach relaxation in Boston. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Boston Climate and Swimming Opportunities in August

Boston lies within the Massachusetts in United States. The average daytime temperature in Boston in August is 79°F (26°C), while the nighttime average is 62°F (17°C). There are typically 10 rainy days during the month, with a total precipitation of 3.7 inches (93 mm). The daylight duration in August in Boston is 14 hours, with an average of 9 hours of sunshine per day. The average wind speed in August is 8 mph (13 km/h), and the humidity level is around 72%.

The water temperature in Boston in August ranges from 66°F to 70°F (19°C to 21°C). At the beginning of the month, the average temperature is around 68°F (20°C), shifting to 68°F (20°C) by mid-August and reaching 68°F (20°C) in the last ten days. Overall, the average sea temperature in Boston for August is 68°F (20°C). Perfect balance of refreshing water and warm air. One of the best conditions for swimming.

Frequently Asked Questions About Water Temperatures in August in Boston