Boston Sea Temperature in December

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

Average water temperature in Boston for December

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

8.21° C

(46.78° F)

highest: 10.43° C (50.77° F)
lowest: 5.38° C (41.68° F)

This water is very cold and can cause pain. We don't recommend you swim in this temperature for anything other than very short swims of 5 to 10 minutes unless you are a very experienced cold water swimmer.

Water temperature range by day in December in Boston

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

Water temperatures for December in Boston in recent years

Day	2024	2023	2022	2021
1	0° C	9.3° C	10.05° C	9.94° C
2	0° C	9.44° C	9.96° C	9.69° C
3	0° C	9.5° C	9.88° C	9.58° C
4	0° C	8.98° C	9.8° C	9.66° C
5	0° C	9.05° C	9.67° C	9.61° C
6	0° C	9.13° C	9.65° C	9.51° C
7	0° C	8.74° C	9.82° C	9.35° C
8	0° C	8.57° C	9.62° C	9.29° C
9	0° C	8.42° C	9.5° C	9.34° C
10	0° C	8.48° C	9.41° C	9.39° C
11	0° C	8.53° C	9.35° C	9.25° C
12	0° C	8.29° C	9.11° C	9.11° C
13	0° C	8.21° C	8.96° C	9.15° C
14	0° C	8.07° C	8.82° C	9.12° C
15	0° C	7.95° C	8.69° C	9.06° C
16	0° C	7.99° C	8.73° C	9.53° C
17	0° C	7.97° C	8.45° C	8.74° C
18	0° C	8.18° C	8.35° C	8.71° C
19	0° C	8.04° C	8.09° C	8.87° C
20	0° C	7.78° C	7.76° C	8.78° C
21	0° C	7.7° C	7.53° C	8.7° C
22	0° C	7.5° C	7.29° C	8.6° C
23	0° C	7.28° C	7.44° C	8.36° C
24	0° C	7.39° C	7.29° C	8.35° C
25	0° C	7.3° C	7.08° C	8.5° C
26	0° C	7.21° C	6.84° C	8.56° C
27	0° C	6.9° C	6.73° C	8.41° C
28	0° C	7.22° C	6.49° C	8.17° C
29	0° C	7.08° C	6.24° C	8.22° C
30	0° C	7.07° C	6.07° C	8.19° C
31	0° C	6.99° C	5.71° C	8.14° C

Water temperature in December for locations near Boston

Tembol

Indonesia, Asia

0.34 miles away

South Boston

United States, North America

1.62 miles away

Carson Beach

United States, North America

2.42 miles away

Chelsea

United States, North America

2.56 miles away

Winthrop

United States, North America

3.84 miles away

Lantera

Indonesia, Asia

4.29 miles away

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Boston 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.

<a href="http://seatemperatures.net/north-america/united-states/boston-december-temperature/">Boston Sea Temperature in December</a>
"Boston Sea Temperature in December". SeaTemperatures.net. Accessed on April 27, 2024. http://seatemperatures.net/north-america/united-states/boston-december-temperature/.
"Boston Sea Temperature in December". SeaTemperatures.net, http://seatemperatures.net/north-america/united-states/boston-december-temperature/. Accessed 27 April, 2024
Boston Sea Temperature in December. SeaTemperatures.net. Retrieved from http://seatemperatures.net/north-america/united-states/boston-december-temperature/.