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 5.0°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

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.

41.0

°F

March 30, 06:41

Trend:

stable

Yesterday:

41.1°F

Tomorrow:

41.3°F

Sunrise:

06:31

Sunset:

19:08

Day Length:

12 h. 37 min.

Boston in April

Minimum:

39.6°F

Average:

42.1°F

Maximum:

45.2°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 41.0°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is about the same as 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 rise 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 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 43.1°F on 2021, while the historical minimum was 36.5°F on 2015.

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 suggests a gradual increase. The average temperature is expected to rise up to 41.5°F, with minimum temperature starting at 41.2°F, while the maximum might reach 41.9°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Mar 16	38.6°F	40.9°F	39.1°F
Mar 17	38.7°F	43.2°F	39.5°F
Mar 18	38.8°F	43.6°F	39.5°F
Mar 19	38.9°F	43.8°F	39.6°F
Mar 20	40.7°F	42.6°F	39.7°F
Mar 21	40.2°F	42.2°F	39.6°F
Mar 22	42.0°F	41.7°F	40.1°F
Mar 23	41.6°F	41.4°F	40.1°F
Mar 24	41.9°F	41.2°F	40.1°F
Mar 25	41.4°F	40.9°F	40.0°F
Mar 26	41.7°F	40.6°F	40.1°F
Mar 27	40.2°F	41.1°F	40.4°F
Mar 28	41.4°F	41.0°F	40.8°F
Mar 29	41.1°F	41.1°F	40.8°F
Mar 30	41.0°F	40.9°F	40.8°F
Mar 31	41.3°F	42.2°F	41.1°F
Apr 1	41.2°F	42.2°F	41.0°F
Apr 2	41.4°F	41.8°F	41.2°F
Apr 3	41.7°F	42.2°F	41.6°F
Apr 4	41.7°F	41.8°F	41.5°F
Apr 5	41.9°F	41.6°F	41.7°F
Apr 6	41.6°F	41.5°F	41.4°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	41.0°F	2mi
Salem	40.4°F	14mi
Plymouth	41.6°F	34mi
Providence	43.4°F	41mi
Bristol	43.8°F	48mi

* current water temperature in this city

** straight line distance from Boston