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 0.97°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.

33.7

°F

February 27, 00:39

Trend:

increasing

Yesterday:

33.7°F

Tomorrow:

33.8°F

Sunrise:

06:23

Sunset:

17:31

Day Length:

11 h. 8 min.

South Boston in March

Minimum:

40.0°F

Average:

41.9°F

Maximum:

45.3°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 33.7°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 4.6°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 stay about the same.

Recent sea temperature and forecast

Today's water temperature is slightly 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 41.0°F on 2017, while the historical minimum was 36.3°F on 2025.

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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 33.7°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
Feb 13	33.4°F	34.5°F	37.7°F
Feb 14	34.3°F	33.6°F	37.6°F
Feb 15	32.0°F	34.1°F	37.2°F
Feb 16	32.9°F	34.7°F	37.4°F
Feb 17	33.4°F	35.1°F	37.8°F
Feb 18	33.8°F	34.3°F	37.3°F
Feb 19	34.4°F	34.1°F	37.5°F
Feb 20	34.8°F	34.3°F	37.4°F
Feb 21	34.8°F	34.7°F	37.3°F
Feb 22	35.1°F	34.6°F	37.1°F
Feb 23	35.4°F	34.9°F	37.3°F
Feb 24	35.4°F	34.9°F	37.4°F
Feb 25	33.4°F	35.4°F	37.6°F
Feb 26	33.7°F	35.4°F	38.2°F
Feb 27	33.7°F	36.3°F	38.3°F
Feb 28	33.8°F	36.6°F	38.4°F
Mar 1	33.7°F	37.7°F	38.4°F
Mar 2	33.6°F	36.6°F	38.4°F
Mar 3	33.5°F	36.7°F	38.3°F
Mar 4	33.5°F	36.4°F	38.3°F
Mar 5	33.9°F	36.6°F	38.6°F
Mar 6	33.7°F	37.1°F	38.5°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 40.8°F in Winter, 45.4°F in Spring, 65.1°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Boston	33.7°F	2mi
Salem	35.8°F	15mi
Plymouth	34.3°F	32mi
Providence	34.0°F	40mi
Bristol	32.9°F	47mi

* current water temperature in this city

** straight line distance from South Boston