All data are in degrees Fahrenheit

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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.
Sea temperature in South Boston now

69.7

°F

July 14, 13:19

Trend:

stable

Yesterday:

68.4°F

Tomorrow:

68.8°F

Sunrise:

05:20

Sunset:

20:20

Day Length:

15 h. 0 min.

South Boston in July

Minimum:

39.3°F

Average:

41.6°F

Maximum:

44.4°F

Sea water temperature in South Boston today

As of now, in South Boston, the water temperature is 69.7°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 2.3°F higher 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 fall considerably.

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 72.3°F on 2023, while the historical minimum was 64.0°F on 2021.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 69.1°F, the minimum temperature may reach 68.8°F, and the maximum might stay at 69.4°F.

Daily water temperature in South Boston

Date Current Year

actual* / forecast**

last year 10 years average
Jun 30 64.8°F 61.5°F 63.2°F
Jul 1 64.4°F 61.6°F 63.8°F
Jul 2 64.0°F 62.8°F 63.9°F
Jul 3 63.7°F 63.5°F 64.2°F
Jul 4 66.7°F 64.0°F 64.9°F
Jul 5 66.0°F 65.1°F 64.9°F
Jul 6 66.0°F 66.3°F 65.4°F
Jul 7 66.1°F 68.4°F 65.9°F
Jul 8 67.0°F 67.1°F 66.0°F
Jul 9 69.9°F 65.2°F 66.5°F
Jul 10 69.3°F 66.7°F 66.3°F
Jul 11 68.6°F 68.5°F 66.4°F
Jul 12 68.6°F 66.9°F 66.8°F
Jul 13 68.4°F 67.2°F 67.1°F
Jul 14 69.7°F 67.7°F 67.4°F
Jul 15 68.8°F 65.4°F 66.5°F
Jul 16 69.2°F 66.5°F 66.9°F
Jul 17 69.0°F 67.2°F 66.7°F
Jul 18 69.1°F 67.3°F 66.8°F
Jul 19 69.0°F 66.9°F 66.7°F
Jul 20 69.2°F 67.0°F 66.8°F
Jul 21 69.4°F 65.6°F 67.0°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 11, 2025, dipping to 32.5°F. The average readings by season are 41.1°F in Winter, 45.1°F in Spring, 65.0°F in Summer, and 58.1°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Boston 69.7°F 2mi
Salem 67.8°F 15mi
Plymouth 67.3°F 32mi
Providence 76.5°F 40mi
Bristol 76.7°F 47mi

* current water temperature in this city

** straight line distance from South Boston