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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

57.4

°F

October 22, 17:10

Trend:

stable

Yesterday:

55.5°F

Tomorrow:

57.1°F

Sunrise:

07:05

Sunset:

17:52

Day Length:

10 h. 47 min.

Boston in October

Minimum:

39.2°F

Average:

41.2°F

Maximum:

44.2°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 57.4°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 0.4°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 fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably 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 60.9°F on 2021, while the historical minimum was 54.3°F on 2015.

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 shows a gradual cooling trend. The average temperature is expected to be 56.4°F, the minimum temperature may reach 55.7°F, and the maximum might stay at 57.1°F.

Daily water temperature in Boston

Date Current Year

actual* / forecast**

 last year 10 years average
Oct 8 63.5°F 62.1°F 60.7°F
Oct 9 61.8°F 62.4°F 60.7°F
Oct 10 61.6°F 63.0°F 60.6°F
Oct 11 59.7°F 61.5°F 60.0°F
Oct 12 59.3°F 61.0°F 59.9°F
Oct 13 59.5°F 61.2°F 59.5°F
Oct 14 59.9°F 60.2°F 59.3°F
Oct 15 59.6°F 57.9°F 58.8°F
Oct 16 59.6°F 57.5°F 58.6°F
Oct 17 56.9°F 56.3°F 57.8°F
Oct 18 55.9°F 56.7°F 57.7°F
Oct 19 56.0°F 56.4°F 57.4°F
Oct 20 55.7°F 54.6°F 57.0°F
Oct 21 55.5°F 55.8°F 56.7°F
Oct 22 57.4°F 57.1°F 57.0°F
Oct 23 57.1°F 56.7°F 56.8°F
Oct 24 57.0°F 57.7°F 56.7°F
Oct 25 56.6°F 57.4°F 56.2°F
Oct 26 56.4°F 56.6°F 56.0°F
Oct 27 56.0°F 56.4°F 55.6°F
Oct 28 56.2°F 56.0°F 55.8°F
Oct 29 55.7°F 55.0°F 55.4°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

January

February

March

April

May

June

July

August

September

October

November

December

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 58.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
South Boston 57.4°F 2mi
Salem 57.4°F 14mi
Plymouth 57.6°F 34mi
Providence 61.6°F 41mi
Bristol 61.1°F 48mi

* current water temperature in this city

** straight line distance from Boston