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

68.1

°F

August 26, 18:47

Trend:

increasing

Yesterday:

68.0°F

Tomorrow:

68.4°F

Sunrise:

06:03

Sunset:

19:29

Day Length:

13 h. 26 min.

South Boston in September

Minimum:

38.5°F

Average:

41.1°F

Maximum:

44.1°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 68.1°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 rise a bit.

Recent sea temperature and forecast

Today's water temperature closely matches the previous two weeks' average, indicating a stable trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 72.3°F on 2021, while the historical minimum was 63.8°F on 2019.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 68.1°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in South Boston

Date Current Year

actual* / forecast**

last year 10 years average
Aug 12 70.8°F 69.2°F 68.8°F
Aug 13 68.5°F 69.5°F 68.7°F
Aug 14 68.3°F 69.6°F 68.6°F
Aug 15 68.4°F 70.5°F 68.8°F
Aug 16 68.4°F 69.4°F 68.4°F
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 67.8°F
Aug 27 68.4°F 67.6°F 68.2°F
Aug 28 68.7°F 66.1°F 68.4°F
Aug 29 68.4°F 65.0°F 68.2°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

* 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 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**
Boston 68.6°F 2mi
Salem 68.1°F 15mi
Plymouth 68.3°F 32mi
Providence 73.0°F 40mi
Bristol 74.0°F 47mi

* current water temperature in this city

** straight line distance from South Boston