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 19.55°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.

67.2

°F

September 12, 13:14

Trend:

increasing

Yesterday:

66.5°F

Tomorrow:

67.4°F

Sunrise:

06:21

Sunset:

19:00

Day Length:

12 h. 39 min.

South Boston in September

Minimum:

38.5°F

Average:

41.1°F

Maximum:

44.1°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 67.2°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 2.0°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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 68.7°F on 2023, while the historical minimum was 60.1°F on 2025.

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 66.9°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 29	69.2°F	65.0°F	68.3°F
Aug 30	68.5°F	65.8°F	68.3°F
Aug 31	68.3°F	65.1°F	67.7°F
Sep 1	68.6°F	64.7°F	67.7°F
Sep 2	67.3°F	64.7°F	66.8°F
Sep 3	66.7°F	65.0°F	66.3°F
Sep 4	66.1°F	65.7°F	65.9°F
Sep 5	66.6°F	64.9°F	66.1°F
Sep 6	67.7°F	64.8°F	66.2°F
Sep 7	65.7°F	66.1°F	66.3°F
Sep 8	65.6°F	65.7°F	66.0°F
Sep 9	64.6°F	63.5°F	65.9°F
Sep 10	66.1°F	61.8°F	65.9°F
Sep 11	66.5°F	61.3°F	65.8°F
Sep 12	67.2°F	60.1°F	65.2°F
Sep 13	67.4°F	61.8°F	65.4°F
Sep 14	67.1°F	60.7°F	65.1°F
Sep 15	67.3°F	62.1°F	65.3°F
Sep 16	67.0°F	62.4°F	65.0°F
Sep 17	66.6°F	61.4°F	64.5°F
Sep 18	66.5°F	63.3°F	64.5°F
Sep 19	66.4°F	64.0°F	64.4°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	67.2°F	2mi
Salem	64.5°F	15mi
Plymouth	66.4°F	32mi
Providence	71.7°F	40mi
Bristol	71.7°F	47mi

* current water temperature in this city

** straight line distance from South Boston