World sea water temperatures

Water temperature in South Boston (MA) in January

Is it warm enough to swim in South Boston in January? Average water temperature in South Boston in January is 40.8°F and therefore is not suitable for comfortable swimming. The warmest sea in South Boston in January is 45.7°F, and the coldest is 35.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in South Boston

Changes water temperature in South Boston in January 2025, 2024

To get an accurate forecast for the water temperature in South Boston for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in South Boston, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of January.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
January 140.6°F42.6°F39.6°F45.7°F
January 240.5°F42.4°F40.1°F45.3°F
January 339.6°F42.8°F39.6°F45.1°F
January 439.7°F42.8°F39.4°F44.6°F
January 538.7°F41.5°F38.7°F44.4°F
January 639.4°F41.5°F39.4°F44.4°F
January 739.6°F41.5°F39.2°F44.4°F
January 839.6°F40.8°F38.7°F44.8°F
January 939.4°F41°F39°F44.2°F
January 1038.5°F40.8°F38.5°F44.8°F
January 1139°F40.8°F39°F43.9°F
January 1238.7°F40.8°F38.7°F43.5°F
January 1338.7°F41.2°F38.7°F43.7°F
January 1437.6°F40.6°F37.6°F43.5°F
January 1536.7°F40.8°F36.7°F43.5°F
Day 2025 2024 Min Max
January 1637.4°F40.8°F37.4°F43°F
January 1737.8°F39.7°F37.8°F42.4°F
January 1837.9°F40.3°F37.9°F42.8°F
January 1938.5°F40.1°F38.5°F43°F
January 2036.9°F40.1°F36.9°F43°F
January 2137.6°F40.1°F37.6°F43.3°F
January 2237.2°F40.5°F37.2°F43.3°F
January 2337.8°F40.5°F37.8°F43.7°F
January 2437.9°F40.3°F37.9°F43.5°F
January 2537°F40.3°F37°F43.2°F
January 2637.4°F40.1°F37.4°F43°F
January 2737.4°F39.9°F37.4°F42.8°F
January 2837.6°F39.9°F37.6°F42.6°F
January 2937.6°F39.7°F37.6°F42.4°F
January 3035.2°F39.6°F35.2°F42.1°F
January 3136°F39.6°F36°F41.9°F
South Boston water temp chart in January

Average water temperature in South Boston in January over a decade

20162017201820192020
42.8°F43.3°F40.1°F40.6°F39.9°F
20212022202320242025
39.7°F41.5°F40.5°F40.8°F38.1°F

South Boston sea state in January

Chart comparing the height of waves in South Boston in January over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in South Boston in January

South Boston water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in January?

Want to know where the water temperature in January is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in January. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Pleasure Bay40.8°F35.2°F45.7°F
M Street Beach40.8°F35.2°F45.7°F
Constitution Beach40.8°F35.4°F45.7°F
Hingham41.2°F36.3°F45.9°F
Hull41.2°F36.3°F45.9°F
Wollaston Beach41.2°F36.3°F45.9°F
Dorchester41.2°F36.3°F45.9°F
Boston Harbor Islands41.2°F36.3°F45.9°F
Yirrell Beach41.2°F36.3°F45.9°F
Deer Island41.2°F36.3°F45.9°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for South Boston is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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