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 10.64°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.

51.2

°F

May 11, 09:01

Trend:

increasing

Yesterday:

50.7°F

Tomorrow:

51.8°F

Sunrise:

05:27

Sunset:

19:54

Day Length:

14 h. 27 min.

South Boston in May

Minimum:

39.9°F

Average:

42.0°F

Maximum:

44.6°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 51.2°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 0.8°F higher 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 rise a bit.

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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 54.2°F on 2023, while the historical minimum was 48.5°F on 2020.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 52.6°F, with minimum temperature starting at 51.8°F, while the maximum might reach 53.4°F.

Daily water temperature in South Boston

Date	Current Year actual* / forecast**	last year	10 years average
Apr 27	46.7°F	47.5°F	46.9°F
Apr 28	48.2°F	48.3°F	47.2°F
Apr 29	49.0°F	47.9°F	47.3°F
Apr 30	48.3°F	49.7°F	47.6°F
May 1	48.2°F	50.2°F	47.6°F
May 2	50.0°F	49.7°F	48.4°F
May 3	49.3°F	48.4°F	48.5°F
May 4	48.6°F	50.1°F	48.7°F
May 5	50.2°F	49.9°F	49.1°F
May 6	50.8°F	49.6°F	49.0°F
May 7	51.4°F	49.5°F	49.4°F
May 8	53.2°F	51.4°F	50.3°F
May 9	51.8°F	53.7°F	50.8°F
May 10	50.7°F	53.3°F	50.4°F
May 11	51.2°F	53.3°F	50.3°F
May 12	51.8°F	53.9°F	51.0°F
May 13	52.1°F	53.2°F	51.3°F
May 14	52.2°F	52.7°F	51.4°F
May 15	52.6°F	53.9°F	51.8°F
May 16	53.0°F	54.8°F	52.2°F
May 17	53.2°F	54.5°F	52.3°F
May 18	53.4°F	54.3°F	52.6°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, 65.1°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Boston	50.7°F	2mi
Salem	49.4°F	15mi
Plymouth	50.4°F	32mi
Providence	54.4°F	40mi
Bristol	54.2°F	47mi

* current water temperature in this city

** straight line distance from South Boston