What is the current water temperature in South Boston?

Q: What is the current water temperature in South Boston?

As of now, in South Boston, the water temperature is 17.57°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

United States > South Boston

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.

63.6

°F

September 16, 21:36

Trend:

decreasing

Yesterday:

65.5°F

Tomorrow:

63.2°F

Sunrise:

06:25

Sunset:

18:53

Day Length:

12 h. 28 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 63.6°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 1.4°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 67.2°F on 2023, while the historical minimum was 62.4°F on 2025.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 62.7°F, the minimum temperature may reach 62.3°F, and the maximum might stay at 63.2°F.

Daily water temperature in South Boston

Date	Current Year actual* / forecast**	last year	10 years average
Sep 2	67.3°F	64.7°F	66.8°F
Sep 3	66.7°F	65.0°F	66.3°F
Sep 4	66.1°F	65.7°F	65.9°F
Sep 5	66.6°F	64.9°F	66.1°F
Sep 6	67.7°F	64.8°F	66.2°F
Sep 7	65.7°F	66.1°F	66.3°F
Sep 8	65.6°F	65.7°F	66.0°F
Sep 9	64.6°F	63.5°F	65.9°F
Sep 10	66.1°F	61.8°F	65.9°F
Sep 11	66.5°F	61.3°F	65.8°F
Sep 12	67.2°F	60.1°F	65.3°F
Sep 13	65.5°F	61.8°F	65.4°F
Sep 14	66.1°F	60.7°F	65.2°F
Sep 15	65.5°F	62.1°F	65.3°F
Sep 16	63.6°F	62.4°F	65.0°F
Sep 17	63.2°F	61.4°F	64.5°F
Sep 18	63.1°F	63.3°F	64.5°F
Sep 19	63.1°F	64.0°F	64.4°F
Sep 20	62.8°F	65.0°F	64.2°F
Sep 21	62.3°F	63.9°F	63.7°F
Sep 22	62.3°F	63.7°F	63.6°F
Sep 23	62.3°F	62.7°F	63.6°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	63.6°F	2mi
Salem	62.3°F	15mi
Plymouth	63.6°F	32mi
Providence	69.8°F	40mi
Bristol	70.2°F	47mi

* current water temperature in this city

** straight line distance from South Boston