All data are in degrees Fahrenheit

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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.
Sea temperature in Boston now

67.9

°F

August 31, 00:36

Trend:

decreasing

Yesterday:

68.5°F

Tomorrow:

67.8°F

Sunrise:

06:08

Sunset:

19:20

Day Length:

13 h. 12 min.

Boston in September

Minimum:

38.5°F

Average:

41.1°F

Maximum:

44.1°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 67.9°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.3°F higher 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 stay about the same.

Recent sea temperature and forecast

Today's water temperature closely matches the previous two weeks' average, indicating a stable 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 72.2°F on 2022, while the historical minimum was 64.4°F on 2017.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 66.7°F, the minimum temperature may reach 66.1°F, and the maximum might stay at 67.8°F.

Daily water temperature in Boston

Date Current Year

actual* / forecast**

last year 10 years average
Aug 17 66.4°F 67.6°F 67.7°F
Aug 18 67.6°F 69.1°F 67.7°F
Aug 19 66.5°F 67.0°F 67.6°F
Aug 20 68.0°F 67.1°F 67.4°F
Aug 21 69.4°F 66.2°F 68.0°F
Aug 22 68.3°F 65.6°F 67.7°F
Aug 23 67.7°F 66.7°F 67.4°F
Aug 24 66.9°F 66.0°F 66.8°F
Aug 25 68.0°F 66.5°F 67.3°F
Aug 26 68.1°F 66.9°F 67.9°F
Aug 27 68.6°F 67.6°F 68.2°F
Aug 28 68.0°F 66.1°F 68.4°F
Aug 29 69.2°F 65.0°F 68.3°F
Aug 30 68.5°F 65.8°F 68.3°F
Aug 31 67.9°F 65.1°F 67.7°F
Sep 1 67.8°F 64.7°F 67.6°F
Sep 2 67.0°F 64.7°F 66.8°F
Sep 3 66.5°F 65.0°F 66.2°F
Sep 4 66.1°F 65.7°F 65.9°F
Sep 5 66.3°F 64.9°F 66.0°F
Sep 6 66.3°F 64.8°F 66.1°F
Sep 7 66.7°F 66.1°F 66.4°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 1, 2026, dipping to 32.0°F. The average readings by season are 40.7°F in Winter, 45.4°F in Spring, 65.2°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
South Boston 67.9°F 2mi
Salem 67.4°F 14mi
Plymouth 68.7°F 34mi
Providence 72.8°F 41mi
Bristol 74.0°F 48mi

* current water temperature in this city

** straight line distance from Boston