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 17.43°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

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.

63.4

°F

July 22, 15:57

Trend:

decreasing

Yesterday:

63.7°F

Tomorrow:

63.3°F

Sunrise:

05:27

Sunset:

20:14

Day Length:

14 h. 47 min.

South Boston in July

Minimum:

39.3°F

Average:

41.5°F

Maximum:

44.4°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 63.4°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. 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 considerably 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 71.7°F on 2020, while the historical minimum was 65.0°F on 2024.

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 histoorical minimum and others when it was close to the historical maximum. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 63.4°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
Jul 8	66.4°F	67.0°F	66.2°F
Jul 9	66.2°F	69.9°F	66.7°F
Jul 10	68.1°F	69.3°F	66.7°F
Jul 11	70.5°F	68.6°F	66.9°F
Jul 12	70.1°F	68.6°F	67.2°F
Jul 13	70.3°F	68.4°F	67.4°F
Jul 14	69.7°F	69.7°F	67.8°F
Jul 15	70.9°F	68.4°F	67.0°F
Jul 16	69.6°F	69.0°F	67.3°F
Jul 17	68.6°F	69.9°F	67.2°F
Jul 18	67.3°F	69.3°F	67.2°F
Jul 19	66.2°F	68.9°F	66.9°F
Jul 20	64.7°F	66.8°F	66.7°F
Jul 21	63.7°F	68.4°F	66.8°F
Jul 22	63.4°F	66.5°F	68.0°F
Jul 23	63.3°F	65.0°F	67.9°F
Jul 24	63.4°F	64.6°F	68.0°F
Jul 25	63.4°F	65.2°F	68.0°F
Jul 26	63.7°F	67.4°F	68.4°F
Jul 27	63.7°F	66.3°F	68.3°F
Jul 28	63.3°F	65.2°F	68.0°F
Jul 29	63.3°F	64.7°F	68.0°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	64.6°F	2mi
Salem	60.2°F	15mi
Plymouth	63.1°F	32mi
Providence	72.1°F	40mi
Bristol	72.8°F	47mi

* current water temperature in this city

** straight line distance from South Boston