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 7.65°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.

45.8

°F

April 15, 04:09

Trend:

increasing

Yesterday:

44.5°F

Tomorrow:

46.3°F

Sunrise:

06:04

Sunset:

19:26

Day Length:

13 h. 22 min.

Boston in April

Minimum:

39.6°F

Average:

42.0°F

Maximum:

45.2°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 45.8°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 1.4°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to rise a bit.

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 maximum temperature for this date. The maximum temperature recorded for this date was 47.1°F on 2021, while the historical minimum was 41.3°F on 2025.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 47.0°F, with minimum temperature starting at 46.3°F, while the maximum might reach 47.6°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Apr 1	40.9°F	40.8°F	41.4°F
Apr 2	40.9°F	42.5°F	41.7°F
Apr 3	41.2°F	41.6°F	42.0°F
Apr 4	41.8°F	41.5°F	41.9°F
Apr 5	43.6°F	41.5°F	42.3°F
Apr 6	42.9°F	42.6°F	42.0°F
Apr 7	42.2°F	42.3°F	42.2°F
Apr 8	42.7°F	42.1°F	42.4°F
Apr 9	41.5°F	43.3°F	42.8°F
Apr 10	42.2°F	42.5°F	42.9°F
Apr 11	42.3°F	42.2°F	42.9°F
Apr 12	44.8°F	41.9°F	43.1°F
Apr 13	44.3°F	41.9°F	43.4°F
Apr 14	44.5°F	41.9°F	44.3°F
Apr 15	45.8°F	41.3°F	44.4°F
Apr 16	46.3°F	43.8°F	45.0°F
Apr 17	46.6°F	43.4°F	45.2°F
Apr 18	47.0°F	45.1°F	45.7°F
Apr 19	46.9°F	43.3°F	45.5°F
Apr 20	47.0°F	43.4°F	45.7°F
Apr 21	47.6°F	45.6°F	46.2°F
Apr 22	47.6°F	45.4°F	46.2°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 1, 2026, dipping to 32.0°F. The average readings by season are 40.7°F in Winter, 45.4°F in Spring, 65.1°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
South Boston	45.8°F	2mi
Salem	44.3°F	14mi
Plymouth	45.1°F	34mi
Providence	48.4°F	41mi
Bristol	49.2°F	48mi

* current water temperature in this city

** straight line distance from Boston