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 19.15°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

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.

66.5

°F

August 19, 18:12

Trend:

decreasing

Yesterday:

67.6°F

Tomorrow:

66.1°F

Sunrise:

05:55

Sunset:

19:40

Day Length:

13 h. 45 min.

South Boston in August

Minimum:

39.4°F

Average:

41.3°F

Maximum:

44.1°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 66.5°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 1.2°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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 71.4°F on 2021, while the historical minimum was 64.5°F on 2019.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 66.2°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
Aug 5	67.6°F	66.6°F	68.0°F
Aug 6	67.6°F	67.3°F	68.2°F
Aug 7	67.9°F	67.3°F	68.1°F
Aug 8	70.7°F	66.9°F	68.4°F
Aug 9	71.1°F	67.2°F	68.7°F
Aug 10	71.3°F	67.6°F	69.1°F
Aug 11	71.4°F	67.1°F	68.6°F
Aug 12	70.8°F	69.2°F	68.8°F
Aug 13	68.5°F	69.5°F	68.7°F
Aug 14	68.3°F	69.6°F	68.6°F
Aug 15	68.4°F	70.5°F	68.8°F
Aug 16	68.4°F	69.4°F	68.4°F
Aug 17	66.4°F	67.6°F	67.7°F
Aug 18	67.6°F	69.1°F	67.7°F
Aug 19	66.5°F	67.0°F	67.7°F
Aug 20	66.1°F	67.1°F	67.3°F
Aug 21	66.7°F	66.2°F	67.9°F
Aug 22	66.4°F	65.6°F	67.6°F
Aug 23	66.1°F	66.7°F	67.4°F
Aug 24	65.6°F	66.0°F	66.8°F
Aug 25	66.0°F	66.5°F	67.3°F
Aug 26	66.6°F	66.9°F	67.8°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 1, 2026, dipping to 32.0°F. The average readings by season are 40.7°F in Winter, 45.4°F in Spring, 65.2°F in Summer, and 58.0°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Boston	66.5°F	2mi
Salem	69.5°F	15mi
Plymouth	68.3°F	32mi
Providence	74.0°F	40mi
Bristol	75.0°F	47mi

* current water temperature in this city

** straight line distance from South Boston