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 18.04°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.

64.5

°F

September 10, 00:57

Trend:

decreasing

Yesterday:

64.6°F

Tomorrow:

64.3°F

Sunrise:

06:19

Sunset:

19:03

Day Length:

12 h. 44 min.

Boston in September

Minimum:

38.5°F

Average:

41.1°F

Maximum:

44.1°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 64.5°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 1.4°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 also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 70.0°F on 2023, while the historical minimum was 61.8°F on 2025.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 63.7°F, the minimum temperature may reach 63.1°F, and the maximum might stay at 64.3°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Aug 27	68.6°F	67.6°F	68.2°F
Aug 28	68.0°F	66.1°F	68.4°F
Aug 29	69.2°F	65.0°F	68.3°F
Aug 30	68.5°F	65.8°F	68.3°F
Aug 31	68.3°F	65.1°F	67.7°F
Sep 1	68.6°F	64.7°F	67.7°F
Sep 2	67.3°F	64.7°F	66.8°F
Sep 3	66.7°F	65.0°F	66.3°F
Sep 4	66.1°F	65.7°F	65.9°F
Sep 5	66.6°F	64.9°F	66.1°F
Sep 6	67.7°F	64.8°F	66.2°F
Sep 7	65.7°F	66.1°F	66.3°F
Sep 8	65.6°F	65.7°F	66.0°F
Sep 9	64.6°F	63.5°F	66.0°F
Sep 10	64.5°F	61.8°F	65.9°F
Sep 11	64.3°F	61.3°F	65.7°F
Sep 12	63.7°F	60.1°F	65.2°F
Sep 13	64.0°F	61.8°F	65.4°F
Sep 14	63.7°F	60.7°F	65.1°F
Sep 15	63.9°F	62.1°F	65.3°F
Sep 16	63.6°F	62.4°F	65.0°F
Sep 17	63.1°F	61.4°F	64.5°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	64.5°F	2mi
Salem	64.5°F	14mi
Plymouth	65.9°F	34mi
Providence	71.0°F	41mi
Bristol	71.2°F	48mi

* current water temperature in this city

** straight line distance from Boston