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 12.06°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.

53.7

°F

May 9, 14:19

Trend:

increasing

Yesterday:

51.4°F

Tomorrow:

53.7°F

Sunrise:

05:30

Sunset:

19:52

Day Length:

14 h. 22 min.

South Boston in May

Minimum:

39.9°F

Average:

42.1°F

Maximum:

44.6°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 53.7°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 3.5°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable 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 is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 55.6°F on 2023, while the historical minimum was 48.5°F on 2016.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 54.5°F, with minimum temperature starting at 53.7°F, while the maximum might reach 55.3°F.

Daily water temperature in South Boston

Date	Current Year actual* / forecast**	last year	10 years average
Apr 25	48.5°F	46.7°F	46.2°F
Apr 26	47.9°F	46.2°F	46.3°F
Apr 27	47.5°F	46.3°F	46.6°F
Apr 28	48.3°F	45.8°F	46.9°F
Apr 29	47.9°F	45.9°F	46.9°F
Apr 30	49.7°F	47.7°F	47.2°F
May 1	50.2°F	47.5°F	47.3°F
May 2	49.7°F	49.7°F	48.0°F
May 3	48.4°F	49.3°F	48.2°F
May 4	50.1°F	48.9°F	48.5°F
May 5	49.9°F	48.9°F	48.9°F
May 6	49.6°F	48.3°F	48.7°F
May 7	49.5°F	48.7°F	49.1°F
May 8	51.4°F	49.9°F	49.9°F
May 9	53.7°F	51.9°F	50.2°F
May 10	53.7°F	52.0°F	50.2°F
May 11	53.8°F	52.1°F	50.3°F
May 12	54.4°F	52.6°F	50.9°F
May 13	54.5°F	52.7°F	51.0°F
May 14	54.6°F	52.8°F	51.1°F
May 15	55.0°F	53.9°F	51.5°F
May 16	55.3°F	53.7°F	51.8°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 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 58.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Boston	53.7°F	2mi
Salem	49.0°F	15mi
Plymouth	53.0°F	32mi
Providence	58.8°F	40mi
Bristol	59.3°F	47mi

* current water temperature in this city

** straight line distance from South Boston