Boston Harbor Sea Temperature in May

Looking to find out what the average sea water temperature in Boston Harbor is for May? Find out what the lowest, highest, and average water temperatures are for Boston Harbor over the past 10 years.

Average water temperature in Boston Harbor for May

The average, high, and low temperatures below should help you if you can swim in the water in Boston Harbor in May.

10.69° C

(51.25° F)

  • highest: 16.28° C (61.3° F)
  • lowest: 6.35° C (43.43° F)

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a very big risk.

Water temperature range by day in May in Boston Harbor

The chart below shows the range of low and high temperatures by day for the month of May in Boston Harbor.

Water temperatures for May in Boston Harbor in recent years

Day 2024 2023 2022 2021
1 8° C 9.24° C 7.55° C 7.99° C
2 8.73° C 9.29° C 7.69° C 8.44° C
3 0° C 9.47° C 7.71° C 8.62° C
4 0° C 9.11° C 8.02° C 8.36° C
5 0° C 9.26° C 8.36° C 8.08° C
6 0° C 9.78° C 8.51° C 8.47° C
7 0° C 10.51° C 8.42° C 8.74° C
8 0° C 11.15° C 8.16° C 8.72° C
9 0° C 11.04° C 8.09° C 8.92° C
10 0° C 11.16° C 8.15° C 9.43° C
11 0° C 11.67° C 8.18° C 9.75° C
12 0° C 11.89° C 8.64° C 10.1° C
13 0° C 12.62° C 9.14° C 10.81° C
14 0° C 12.85° C 9.07° C 11.45° C
15 0° C 12.97° C 9.91° C 11.89° C
16 0° C 12.97° C 10.37° C 11.7° C
17 0° C 12.4° C 10.55° C 11.91° C
18 0° C 11.77° C 10.59° C 12.5° C
19 0° C 11.46° C 10.62° C 12.97° C
20 0° C 11.47° C 10.68° C 13.3° C
21 0° C 11.61° C 10.73° C 13.42° C
22 0° C 11.81° C 11.43° C 14° C
23 0° C 11.86° C 11.61° C 14.71° C
24 0° C 12.04° C 11.6° C 14.35° C
25 0° C 12.08° C 11.67° C 13.45° C
26 0° C 12.32° C 12.08° C 13.05° C
27 0° C 13.14° C 12.45° C 13.22° C
28 0° C 13.34° C 12.94° C 12.73° C
29 0° C 13.43° C 14.01° C 11.43° C
30 0° C 13.58° C 14.33° C 10.49° C
31 0° C 13.79° C 13.44° C 10.51° C

Water temperature in May for locations near Boston Harbor

Winthrop

United States, North America

2.56 miles away

South Boston

United States, North America

3.73 miles away

Carson Beach

United States, North America

3.83 miles away

Hull

United States, North America

4.25 miles away

Wollaston Beach

United States, North America

4.45 miles away

Boston

United States, North America

4.55 miles away

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Boston Harbor comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.

The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.

If you'd like to use any of the information above in the format it is presented, please use the citation tool below.

  • "Boston Harbor Sea Temperature in May". SeaTemperatures.net. Accessed on May 4, 2024. http://seatemperatures.net/north-america/united-states/boston-harbor-may-temperature/.

  • "Boston Harbor Sea Temperature in May". SeaTemperatures.net, http://seatemperatures.net/north-america/united-states/boston-harbor-may-temperature/. Accessed 4 May, 2024

  • Boston Harbor Sea Temperature in May. SeaTemperatures.net. Retrieved from http://seatemperatures.net/north-america/united-states/boston-harbor-may-temperature/.