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 11.06°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.

51.9

°F

May 9, 03:23

Trend:

increasing

Yesterday:

51.4°F

Tomorrow:

51.9°F

Sunrise:

05:30

Sunset:

19:52

Day Length:

14 h. 22 min.

Boston in May

Minimum:

39.9°F

Average:

42.1°F

Maximum:

44.6°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 51.9°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 higher 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 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 55.6°F on 2023, while the historical minimum was 48.5°F on 2016.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 52.7°F, with minimum temperature starting at 51.9°F, while the maximum might reach 53.5°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Apr 25	48.5°F	46.7°F	46.2°F
Apr 26	47.9°F	46.2°F	46.3°F
Apr 27	47.5°F	46.3°F	46.6°F
Apr 28	48.3°F	45.8°F	46.9°F
Apr 29	47.9°F	45.9°F	46.9°F
Apr 30	49.7°F	47.7°F	47.2°F
May 1	50.2°F	47.5°F	47.3°F
May 2	49.7°F	49.7°F	48.0°F
May 3	48.4°F	49.3°F	48.2°F
May 4	50.1°F	48.9°F	48.5°F
May 5	49.9°F	48.9°F	48.9°F
May 6	49.6°F	48.3°F	48.7°F
May 7	49.5°F	48.7°F	49.1°F
May 8	51.4°F	49.9°F	49.7°F
May 9	51.9°F	51.9°F	50.2°F
May 10	51.9°F	52.0°F	50.2°F
May 11	52.0°F	52.1°F	50.3°F
May 12	52.6°F	52.6°F	50.9°F
May 13	52.7°F	52.7°F	51.0°F
May 14	52.8°F	52.8°F	51.1°F
May 15	53.2°F	53.9°F	51.5°F
May 16	53.5°F	53.7°F	51.8°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	51.9°F	2mi
Salem	49.5°F	14mi
Plymouth	50.3°F	34mi
Providence	56.8°F	41mi
Bristol	57.3°F	48mi

* current water temperature in this city

** straight line distance from Boston