Nantasket Beach water temperature

Typically about 67° in August — refreshing.

from an offshore buoy east of Boston, about 12 miles away

refreshing

bath-warm 80° and up perfect 72–79° refreshing 65–71° brisk below 65° 67° typical for August

The year at a glance

Rarely reaches swimmable temperatures.

30° 40° 50° 60° 70° 80° 67° 40° JFMAMJJASOND January: typically 43° — brisk February: typically 40° — brisk March: typically 41° — brisk April: typically 44° — brisk May: typically 52° — brisk June: typically 61° — brisk July: typically 66° — refreshing August: typically 67° — refreshing September: typically 65° — refreshing October: typically 59° — brisk November: typically 52° — brisk December: typically 47° — brisk

Month by month

Month Typical Feels
January 43° brisk
February 40° brisk
March 41° brisk
April 44° brisk
May 52° brisk
June 61° brisk
July 66° refreshing
August 67° refreshing
September 65° refreshing
October 59° brisk
November 52° brisk
December 47° brisk

About this reading

The reading comes from an offshore buoy east of Boston riding about 12 miles out; the surf zone usually reads close to it, though sun-warmed shallows can run warmer on calm afternoons.

Reading from an offshore buoy east of Boston, about 12 miles away.

Warm water says nothing about surf, rip currents, or bacteria — check local lifeguard flags and advisories.