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 1.48°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.

34.7

°F

February 5, 12:09

Trend:

stable

Yesterday:

34.3°F

Tomorrow:

34.6°F

Sunrise:

06:54

Sunset:

17:03

Day Length:

10 h. 9 min.

South Boston in February

Minimum:

39.6°F

Average:

42.1°F

Maximum:

45.7°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 34.7°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 3.7°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature closely matches the previous two weeks' average, indicating a stable trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 41.4°F on 2017, while the historical minimum was 35.7°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. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 34.2°F, the minimum temperature may reach 34.0°F, and the maximum might stay at 34.6°F.

Daily water temperature in South Boston

Date	Current Year actual* / forecast**	last year	10 years average
Jan 22	37.1°F	37.4°F	39.8°F
Jan 23	36.4°F	37.0°F	39.8°F
Jan 24	35.4°F	37.5°F	39.9°F
Jan 25	36.4°F	37.6°F	39.8°F
Jan 26	36.7°F	37.1°F	39.6°F
Jan 27	36.1°F	37.3°F	39.3°F
Jan 28	35.1°F	37.1°F	39.0°F
Jan 29	35.1°F	37.4°F	39.1°F
Jan 30	33.0°F	37.4°F	38.9°F
Jan 31	33.0°F	35.2°F	38.4°F
Feb 1	32.0°F	35.7°F	38.3°F
Feb 2	32.7°F	33.8°F	38.1°F
Feb 3	32.3°F	34.6°F	38.1°F
Feb 4	34.3°F	35.3°F	38.2°F
Feb 5	34.7°F	35.7°F	38.4°F
Feb 6	34.6°F	34.5°F	38.4°F
Feb 7	34.5°F	34.7°F	38.2°F
Feb 8	34.3°F	33.6°F	38.0°F
Feb 9	34.0°F	34.1°F	37.7°F
Feb 10	34.0°F	32.9°F	37.7°F
Feb 11	34.1°F	32.5°F	37.8°F
Feb 12	34.2°F	33.8°F	37.9°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 1, 2026, dipping to 32.0°F. The average readings by season are 40.9°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	34.7°F	2mi
Salem	36.1°F	15mi
Plymouth	34.6°F	32mi
Providence	33.8°F	40mi
Bristol	33.1°F	47mi

* current water temperature in this city

** straight line distance from South Boston