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 6.0°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.

42.8

°F

December 21, 07:09

Trend:

increasing

Yesterday:

42.7°F

Tomorrow:

43.0°F

Sunrise:

07:11

Sunset:

16:15

Day Length:

9 h. 4 min.

Boston in December

Minimum:

39.3°F

Average:

41.2°F

Maximum:

43.8°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 42.8°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 0.9°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 rise a bit.

Recent sea temperature and forecast

Today's water temperature is slightly 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 46.6°F on 2015, while the historical minimum was 40.0°F on 2022.

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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 42.5°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Dec 7	43.9°F	44.0°F	46.2°F
Dec 8	43.1°F	44.9°F	45.9°F
Dec 9	43.6°F	45.1°F	45.9°F
Dec 10	43.9°F	45.4°F	45.9°F
Dec 11	44.2°F	45.4°F	45.7°F
Dec 12	44.4°F	45.2°F	45.6°F
Dec 13	43.9°F	45.2°F	45.4°F
Dec 14	42.2°F	43.8°F	44.9°F
Dec 15	41.0°F	44.1°F	44.7°F
Dec 16	41.7°F	41.9°F	44.4°F
Dec 17	42.3°F	42.9°F	44.5°F
Dec 18	42.9°F	43.1°F	44.6°F
Dec 19	42.4°F	43.7°F	44.3°F
Dec 20	42.7°F	43.3°F	43.9°F
Dec 21	42.8°F	44.4°F	43.7°F
Dec 22	43.0°F	43.5°F	43.9°F
Dec 23	42.7°F	42.4°F	43.7°F
Dec 24	42.3°F	42.5°F	43.2°F
Dec 25	42.2°F	42.8°F	43.2°F
Dec 26	42.4°F	43.3°F	43.3°F
Dec 27	42.3°F	43.2°F	43.2°F
Dec 28	42.3°F	43.2°F	43.2°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 22, 2021, dipping to 33.7°F. The average readings by season are 41.3°F in Winter, 44.9°F in Spring, 64.8°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
South Boston	42.8°F	2mi
Salem	44.5°F	14mi
Plymouth	44.3°F	34mi
Providence	43.3°F	41mi
Bristol	43.1°F	48mi

* current water temperature in this city

** straight line distance from Boston