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 20.97°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.

69.7

°F

July 14, 20:40

Trend:

stable

Yesterday:

68.4°F

Tomorrow:

68.8°F

Sunrise:

05:20

Sunset:

20:20

Day Length:

15 h. 0 min.

Boston in July

Minimum:

39.3°F

Average:

41.6°F

Maximum:

44.4°F

Sea water temperature in Boston today

As of now, in Boston, the water temperature is 69.7°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 2.3°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 considerably.

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 72.3°F on 2023, while the historical minimum was 64.0°F on 2021.

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 shows a gradual cooling trend. The average temperature is expected to be 69.1°F, the minimum temperature may reach 68.8°F, and the maximum might stay at 69.4°F.

Daily water temperature in Boston

Date	Current Year actual* / forecast**	last year	10 years average
Jun 30	64.8°F	61.5°F	63.2°F
Jul 1	64.4°F	61.6°F	63.8°F
Jul 2	64.0°F	62.8°F	63.9°F
Jul 3	63.7°F	63.5°F	64.2°F
Jul 4	66.7°F	64.0°F	64.9°F
Jul 5	66.0°F	65.1°F	64.9°F
Jul 6	66.0°F	66.3°F	65.4°F
Jul 7	66.1°F	68.4°F	65.9°F
Jul 8	67.0°F	67.1°F	66.0°F
Jul 9	69.9°F	65.2°F	66.5°F
Jul 10	69.3°F	66.7°F	66.3°F
Jul 11	68.6°F	68.5°F	66.4°F
Jul 12	68.6°F	66.9°F	66.8°F
Jul 13	68.4°F	67.2°F	67.1°F
Jul 14	69.7°F	67.7°F	67.4°F
Jul 15	68.8°F	65.4°F	66.5°F
Jul 16	69.2°F	66.5°F	66.9°F
Jul 17	69.0°F	67.2°F	66.7°F
Jul 18	69.1°F	67.3°F	66.8°F
Jul 19	69.0°F	66.9°F	66.7°F
Jul 20	69.2°F	67.0°F	66.8°F
Jul 21	69.4°F	65.6°F	67.0°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	69.7°F	2mi
Salem	67.8°F	14mi
Plymouth	67.3°F	34mi
Providence	76.5°F	41mi
Bristol	76.7°F	48mi

* current water temperature in this city

** straight line distance from Boston