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 6.78°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

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.

44.2

°F

December 2, 15:20

Trend:

decreasing

Yesterday:

44.2°F

Tomorrow:

44.0°F

Sunrise:

06:54

Sunset:

16:12

Day Length:

9 h. 18 min.

South Boston in December

Minimum:

38.8°F

Average:

41.1°F

Maximum:

43.8°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 44.2°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 2.9°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 49.7°F on 2016, while the historical minimum was 44.9°F on 2023.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 43.4°F, the minimum temperature may reach 42.9°F, and the maximum might stay at 44.0°F.

Daily water temperature in South Boston

Date	Current Year actual* / forecast**	last year	10 years average
Nov 18	49.1°F	49.0°F	49.7°F
Nov 19	47.4°F	49.7°F	49.4°F
Nov 20	47.5°F	49.4°F	49.2°F
Nov 21	44.9°F	49.4°F	49.0°F
Nov 22	45.3°F	49.0°F	48.8°F
Nov 23	44.0°F	49.2°F	48.6°F
Nov 24	45.1°F	47.6°F	48.3°F
Nov 25	45.5°F	47.4°F	47.9°F
Nov 26	45.6°F	47.3°F	47.7°F
Nov 27	46.1°F	46.9°F	47.8°F
Nov 28	47.2°F	45.7°F	47.6°F
Nov 29	45.7°F	46.1°F	47.2°F
Nov 30	43.9°F	45.3°F	46.8°F
Dec 1	44.2°F	46.0°F	47.0°F
Dec 2	44.2°F	45.7°F	47.1°F
Dec 3	44.0°F	44.1°F	46.9°F
Dec 4	43.8°F	44.6°F	46.7°F
Dec 5	43.6°F	44.8°F	46.5°F
Dec 6	43.6°F	44.8°F	46.5°F
Dec 7	43.2°F	43.9°F	46.1°F
Dec 8	42.9°F	43.1°F	45.8°F
Dec 9	43.0°F	43.6°F	45.9°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 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 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Boston	44.2°F	2mi
Salem	46.6°F	15mi
Plymouth	45.8°F	32mi
Providence	46.3°F	40mi
Bristol	45.3°F	47mi

* current water temperature in this city

** straight line distance from South Boston