All data are in degrees Fahrenheit

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Water temperature in South Boston

Detailed information about the current water temperature in South 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 South Boston now

66.1

°F

August 28, 13:28

Trend:

decreasing

Yesterday:

67.6°F

Tomorrow:

65.9°F

Sunrise:

06:05

Sunset:

19:25

Day Length:

13 h. 20 min.

South Boston in September

Minimum:

38.5°F

Average:

41.2°F

Maximum:

44.1°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 66.1°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 2.6°F lower 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 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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 73.6°F on 2021, while the historical minimum was 65.1°F on 2017.

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 65.0°F, the minimum temperature may reach 63.5°F, and the maximum might stay at 65.9°F.

Daily water temperature in South Boston

Date Current Year

actual* / forecast**

last year 10 years average
Aug 14 69.6°F 65.3°F 68.5°F
Aug 15 70.5°F 65.4°F 68.6°F
Aug 16 69.4°F 67.3°F 68.2°F
Aug 17 67.6°F 66.1°F 67.8°F
Aug 18 69.1°F 66.5°F 67.8°F
Aug 19 67.0°F 66.5°F 67.7°F
Aug 20 67.1°F 66.2°F 67.4°F
Aug 21 66.2°F 67.3°F 67.8°F
Aug 22 65.6°F 65.2°F 67.6°F
Aug 23 66.7°F 64.1°F 67.4°F
Aug 24 66.0°F 64.7°F 66.8°F
Aug 25 66.5°F 66.2°F 67.3°F
Aug 26 66.9°F 66.5°F 67.9°F
Aug 27 67.6°F 66.5°F 68.3°F
Aug 28 66.1°F 66.6°F 68.7°F
Aug 29 65.9°F 68.0°F 68.6°F
Aug 30 65.9°F 67.6°F 68.5°F
Aug 31 65.4°F 65.2°F 68.0°F
Sep 1 65.4°F 65.7°F 68.0°F
Sep 2 64.6°F 67.6°F 67.2°F
Sep 3 64.0°F 67.8°F 66.6°F
Sep 4 63.5°F 65.7°F 66.1°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 South Boston by month

In an average year, South Boston offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in South 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**
Boston 68.0°F 2mi
Salem 64.6°F 15mi
Plymouth 66.5°F 32mi
Providence 71.2°F 40mi
Bristol 71.6°F 47mi

* current water temperature in this city

** straight line distance from South Boston