World sea water temperatures

Water temperature in Boston Harbor (MA) in October

Is it warm enough to swim in Boston Harbor in October? Average water temperature in Boston Harbor in October is 57.6°F and therefore is not suitable for comfortable swimming. The warmest sea in Boston Harbor in October is 64.4°F, and the coldest is 51.4°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Boston Harbor

Changes water temperature in Boston Harbor in October 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
October 163.1°F62.2°F58.3°F64.2°F
October 262.2°F62.8°F58.5°F64°F
October 361.3°F62.1°F58.6°F63.7°F
October 461.7°F62.2°F57.7°F64.4°F
October 562.4°F62.8°F57.2°F63.3°F
October 662.8°F62.6°F57.2°F62.8°F
October 7 62.2°F56.8°F62.2°F
October 8 61.9°F56.7°F62.4°F
October 9 62.2°F56.8°F62.4°F
October 10 60.4°F57.2°F63.1°F
October 11 59.9°F56.7°F63°F
October 12 59.4°F55.8°F62.2°F
October 13 59.4°F55.4°F62.4°F
October 14 57.7°F55°F62.4°F
October 15 57.7°F54.9°F61.7°F
Day 2025 2024 Min Max
October 16 56.7°F55.4°F61.3°F
October 17 56.8°F55.2°F62.4°F
October 18 57°F54.9°F62.1°F
October 19 55.2°F52.7°F61.7°F
October 20 56.5°F53.2°F60.4°F
October 21 57.6°F53.1°F61.2°F
October 22 56.7°F52.9°F59.9°F
October 23 57.9°F52.2°F59°F
October 24 57.4°F52°F58.8°F
October 25 56.8°F51.6°F58.3°F
October 26 56.3°F52.3°F57.9°F
October 27 56.1°F52.2°F59.2°F
October 28 54.9°F52°F59.2°F
October 29 54.3°F52.2°F58.3°F
October 30 54.1°F51.6°F57.6°F
October 31 54.1°F51.4°F57.2°F
Boston Harbor water temp chart in October

Average water temperature in Boston Harbor in October over a decade

20152016201720182019
56.1°F58.3°F59.2°F58.8°F56.5°F
20202021202220232024
57.6°F60.3°F57.7°F59.5°F58.5°F

Boston Harbor sea state in October

Chart comparing the height of waves in Boston Harbor in October 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 Boston Harbor in October

Boston Harbor 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 October?

Want to know where the water temperature in October 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 October. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Carson Beach57.6°F51.4°F64.4°F
South Boston57.6°F51.4°F64.4°F
Wollaston Beach57.6°F51.6°F64.2°F
Dorchester57.6°F51.6°F64.2°F
Pleasure Bay57.6°F51.4°F64.4°F
Boston Harbor Islands57.6°F51.6°F64.2°F
Yirrell Beach57.6°F51.6°F64.2°F
Deer Island57.6°F51.6°F64.2°F
M Street Beach57.6°F51.4°F64.4°F
Constitution Beach57.6°F51.4°F64.6°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 Boston Harbor 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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