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 20.9°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.

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.

69.6

°F

July 16, 13:26

Trend:

stable

Yesterday:

70.9°F

Tomorrow:

69.7°F

Sunrise:

05:21

Sunset:

20:19

Day Length:

14 h. 58 min.

Boston in July

Minimum:

39.3°F

Average:

41.5°F

Maximum:

44.4°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 69.6°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 2.6°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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 71.1°F on 2019, while the historical minimum was 65.0°F on 2017.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 69.9°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Jul 2	66.6°F	64.0°F	64.4°F
Jul 3	66.9°F	63.7°F	64.7°F
Jul 4	69.2°F	66.7°F	65.6°F
Jul 5	69.4°F	66.0°F	65.5°F
Jul 6	69.2°F	66.0°F	65.9°F
Jul 7	68.8°F	66.1°F	66.3°F
Jul 8	66.4°F	67.0°F	66.2°F
Jul 9	66.2°F	69.9°F	66.7°F
Jul 10	68.1°F	69.3°F	66.7°F
Jul 11	70.5°F	68.6°F	66.9°F
Jul 12	70.1°F	68.6°F	67.2°F
Jul 13	70.3°F	68.4°F	67.4°F
Jul 14	69.7°F	69.7°F	67.8°F
Jul 15	70.9°F	68.4°F	67.0°F
Jul 16	69.6°F	69.0°F	67.0°F
Jul 17	69.7°F	69.9°F	67.1°F
Jul 18	69.8°F	69.3°F	67.2°F
Jul 19	69.5°F	68.9°F	67.0°F
Jul 20	69.5°F	66.8°F	66.9°F
Jul 21	69.7°F	68.4°F	67.1°F
Jul 22	70.6°F	66.5°F	68.0°F
Jul 23	70.5°F	65.0°F	67.9°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	69.6°F	2mi
Salem	67.7°F	14mi
Plymouth	68.9°F	34mi
Providence	75.5°F	41mi
Bristol	75.3°F	48mi

* current water temperature in this city

** straight line distance from Boston