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 18.85°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.

65.9

°F

August 1, 12:13

Trend:

decreasing

Yesterday:

66.5°F

Tomorrow:

65.6°F

Sunrise:

05:36

Sunset:

20:04

Day Length:

14 h. 28 min.

Boston in August

Minimum:

39.4°F

Average:

41.3°F

Maximum:

44.1°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 65.9°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 2.7°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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 74.4°F on 2020, while the historical minimum was 64.4°F on 2024.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 65.4°F, the minimum temperature may reach 65.3°F, and the maximum might stay at 65.6°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Jul 18	67.3°F	69.3°F	67.2°F
Jul 19	66.2°F	68.9°F	66.9°F
Jul 20	64.7°F	66.8°F	66.7°F
Jul 21	63.7°F	68.4°F	66.8°F
Jul 22	63.4°F	66.5°F	67.6°F
Jul 23	65.0°F	65.0°F	67.6°F
Jul 24	64.8°F	64.6°F	67.7°F
Jul 25	64.7°F	65.2°F	67.7°F
Jul 26	65.3°F	67.4°F	68.1°F
Jul 27	64.8°F	66.3°F	68.0°F
Jul 28	64.9°F	65.2°F	67.7°F
Jul 29	66.0°F	64.7°F	67.8°F
Jul 30	67.5°F	67.4°F	68.1°F
Jul 31	66.5°F	67.4°F	68.1°F
Aug 1	65.9°F	69.3°F	68.6°F
Aug 2	65.6°F	67.2°F	68.3°F
Aug 3	65.4°F	65.8°F	68.1°F
Aug 4	65.3°F	65.4°F	68.0°F
Aug 5	65.3°F	66.6°F	68.1°F
Aug 6	65.5°F	67.3°F	68.2°F
Aug 7	65.4°F	67.3°F	68.2°F
Aug 8	65.4°F	66.9°F	68.1°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 1, 2026, dipping to 32.0°F. The average readings by season are 40.7°F in Winter, 45.4°F in Spring, 65.2°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
South Boston	65.9°F	2mi
Salem	66.3°F	14mi
Plymouth	65.5°F	34mi
Providence	71.1°F	41mi
Bristol	71.7°F	48mi

* current water temperature in this city

** straight line distance from Boston