Massachusetts: water temperature

At sea, 14.1 °C on average across 19 stations, from 12.2 °C (Jeffreys Ledge, NH) to 17.2 °C (Chatham, cap Cod). In fresh water, 10.4 °C on average across 21 stations, from 6.9 °C (Green River Near Colrain, MA) to 15.6 °C (Fresh Pond In Gate House At Cambridge, MA (sonde : Fresh Pond Sonde)).

See on the map

Sea and ocean

Lakes and rivers

Where to swim, month by month

The normal sea temperature each month along the coast: pick a month to see where the water is warmest and whether you can swim.

• January 7.0 °C · up to 8.0 °C
• February 5.3 °C · up to 6.5 °C
• March 5.2 °C · up to 6.0 °C
• April 6.9 °C · up to 7.5 °C
• May 10.2 °C · up to 11.2 °C
• June 14.5 °C · up to 16.1 °C
• July 19.7 °C · up to 21.5 °C
• August 20.9 °C · up to 22.6 °C
• September 19.0 °C · up to 20.4 °C
• October 15.9 °C · up to 17.4 °C
• November 12.1 °C · up to 13.8 °C
• December 9.2 °C · up to 10.2 °C

Warmest water today

Where these numbers come from

Every value is a real reading from an instrument, at its position: a buoy, a wharf, a river or lake station. It keeps the time it was measured. A reading too far from those of nearby stations is marked with a “?”. Between stations, the map gives a satellite or model estimate, always labelled as such.

Sources: Bouées de houle CDIP, Golfe du Maine (NERACOOS), NOAA CO-OPS, NOAA NDBC, USGS, eaux des États-Unis. Sources and credits

Nearby

• Rhode Island 25 stations · sea 14.3 °C · fresh water 9.7 °C
• Connecticut 17 stations · sea 14.5 °C · fresh water 11.4 °C
• Vermont 4 stations · fresh water 8.9 °C
• New Hampshire 12 stations · sea 11.9 °C · fresh water 8.2 °C
• New Jersey 58 stations · sea 14.9 °C · fresh water 12.4 °C
• New York 95 stations · sea 14.6 °C · fresh water 11.2 °C