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 18.88°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.

66.0

°F

July 29, 16:06

Trend:

increasing

Yesterday:

64.9°F

Tomorrow:

66.2°F

Sunrise:

05:33

Sunset:

20:07

Day Length:

14 h. 34 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 66.0°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 2.0°F lower 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 rise a bit.

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 75.0°F on 2020, while the historical minimum was 64.1°F on 2024.

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. 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
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	67.6°F
Jul 23	65.0°F	65.0°F	67.6°F
Jul 24	64.8°F	64.6°F	67.7°F
Jul 25	64.7°F	65.2°F	67.7°F
Jul 26	65.3°F	67.4°F	68.1°F
Jul 27	64.8°F	66.3°F	68.0°F
Jul 28	64.9°F	65.2°F	67.7°F
Jul 29	66.0°F	64.7°F	68.0°F
Jul 30	66.2°F	67.4°F	68.1°F
Jul 31	66.3°F	67.4°F	68.3°F
Aug 1	66.7°F	69.3°F	68.6°F
Aug 2	66.3°F	67.2°F	68.3°F
Aug 3	66.1°F	65.8°F	68.1°F
Aug 4	66.0°F	65.4°F	68.0°F
Aug 5	66.1°F	66.6°F	68.1°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	66.0°F	2mi
Salem	65.7°F	15mi
Plymouth	68.3°F	32mi
Providence	73.1°F	40mi
Bristol	73.9°F	47mi

* current water temperature in this city

** straight line distance from South Boston