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 6.5°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.

43.7

°F

April 18, 00:17

Trend:

increasing

Yesterday:

43.4°F

Tomorrow:

43.8°F

Sunrise:

05:59

Sunset:

19:29

Day Length:

13 h. 30 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 43.7°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 1.7°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 48.0°F on 2022, while the historical minimum was 42.4°F on 2018.

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 44.2°F, with minimum temperature starting at 43.8°F, while the maximum might reach 44.4°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Apr 4	41.5°F	41.8°F	41.5°F
Apr 5	41.5°F	41.6°F	41.7°F
Apr 6	42.6°F	41.5°F	41.5°F
Apr 7	42.3°F	41.4°F	41.8°F
Apr 8	42.1°F	40.3°F	42.0°F
Apr 9	43.3°F	41.3°F	42.5°F
Apr 10	42.5°F	42.4°F	42.5°F
Apr 11	42.2°F	42.9°F	42.5°F
Apr 12	41.9°F	42.6°F	42.5°F
Apr 13	41.9°F	45.8°F	43.0°F
Apr 14	41.9°F	45.2°F	43.9°F
Apr 15	41.3°F	44.9°F	44.1°F
Apr 16	43.8°F	45.1°F	44.7°F
Apr 17	43.4°F	46.4°F	45.1°F
Apr 18	43.7°F	47.2°F	45.4°F
Apr 19	43.8°F	47.0°F	45.5°F
Apr 20	43.9°F	46.8°F	45.7°F
Apr 21	44.2°F	47.4°F	46.0°F
Apr 22	44.2°F	46.7°F	46.0°F
Apr 23	44.4°F	47.0°F	46.1°F
Apr 24	44.3°F	46.6°F	46.1°F
Apr 25	44.3°F	46.7°F	46.0°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	43.7°F	2mi
Salem	42.6°F	14mi
Plymouth	44.1°F	34mi
Providence	45.5°F	41mi
Bristol	44.7°F	48mi

* current water temperature in this city

** straight line distance from Boston