What is the current water temperature in Boston?

Q: What is the current water temperature in Boston?

As of now, in Boston, the water temperature is 18.94°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

United States > Boston

Water temperature in Boston

Detailed information about the current water temperature in Boston. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

66.1

°F

August 28, 13:27

Trend:

decreasing

Yesterday:

67.6°F

Tomorrow:

65.9°F

Sunrise:

06:05

Sunset:

19:25

Day Length:

13 h. 20 min.

Boston in September

Minimum:

38.5°F

Average:

41.2°F

Maximum:

44.1°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 66.1°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 2.6°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 73.6°F on 2021, while the historical minimum was 65.1°F on 2017.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 65.0°F, the minimum temperature may reach 63.5°F, and the maximum might stay at 65.9°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Aug 14	69.6°F	65.3°F	68.5°F
Aug 15	70.5°F	65.4°F	68.6°F
Aug 16	69.4°F	67.3°F	68.2°F
Aug 17	67.6°F	66.1°F	67.8°F
Aug 18	69.1°F	66.5°F	67.8°F
Aug 19	67.0°F	66.5°F	67.7°F
Aug 20	67.1°F	66.2°F	67.4°F
Aug 21	66.2°F	67.3°F	67.8°F
Aug 22	65.6°F	65.2°F	67.6°F
Aug 23	66.7°F	64.1°F	67.4°F
Aug 24	66.0°F	64.7°F	66.8°F
Aug 25	66.5°F	66.2°F	67.3°F
Aug 26	66.9°F	66.5°F	67.9°F
Aug 27	67.6°F	66.5°F	68.3°F
Aug 28	66.1°F	66.6°F	68.7°F
Aug 29	65.9°F	68.0°F	68.6°F
Aug 30	65.9°F	67.6°F	68.5°F
Aug 31	65.4°F	65.2°F	68.0°F
Sep 1	65.4°F	65.7°F	68.0°F
Sep 2	64.6°F	67.6°F	67.2°F
Sep 3	64.0°F	67.8°F	66.6°F
Sep 4	63.5°F	65.7°F	66.1°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Boston by month

In an average year, Boston offers no days when the water temperature is warm enough to swim comfortably.

The warmest water in Boston was recorded on July 29, 2020, reaching a 75.0°F. While the coldest temperature occurred on February 11, 2025, dipping to 32.5°F. The average readings by season are 41.1°F in Winter, 45.1°F in Spring, 65.0°F in Summer, and 58.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
South Boston	66.1°F	2mi
Salem	64.6°F	14mi
Plymouth	66.5°F	34mi
Providence	71.2°F	41mi
Bristol	71.6°F	48mi

* current water temperature in this city

** straight line distance from Boston