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Water temperature in Boston Harbor Islands (MA) in July

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Is it warm enough to swim in Boston Harbor Islands in July? Average water temperature in Boston Harbor Islands in July is 66.2°F and therefore is not suitable for comfortable swimming. The warmest sea in Boston Harbor Islands in July is 73.9°F, and the coldest is 59.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Boston Harbor Islands

Changes water temperature in Boston Harbor Islands in July 2025, 2024

To get an accurate forecast for the water temperature in Boston Harbor Islands 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 Islands, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of July.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
July 163.9°F61.2°F59.9°F65.8°F
July 264.4°F60.6°F59.7°F67.6°F
July 366°F60.8°F60.3°F68°F
July 464.9°F64°F60.6°F66.6°F
July 565.5°F66°F61.5°F67.8°F
July 664.9°F68°F61.5°F69.1°F
July 765.8°F66.9°F61.9°F69.8°F
July 868.5°F65.7°F62.2°F69.6°F
July 967.5°F66°F61.3°F69.6°F
July 1067.1°F66.7°F61.7°F69.6°F
July 1167.1°F64.2°F62.1°F70°F
July 1267.5°F64.8°F63.1°F70.7°F
July 1366.9°F65.3°F63.5°F69.1°F
July 1466.2°F63.7°F62.2°F70.2°F
July 1566°F65.7°F61.5°F70.7°F
Day 2025 2024 Min Max
July 1668°F65.3°F62.6°F70.3°F
July 1768.4°F66°F61.9°F70.9°F
July 1867.8°F65.5°F62.8°F70.9°F
July 1967.8°F66.4°F63.3°F71.4°F
July 2068.5°F64.4°F63.3°F71.4°F
July 2165.3°F64.6°F63.5°F71.8°F
July 2263.3°F65.5°F63.3°F72.1°F
July 2363.7°F66°F63.5°F72.5°F
July 2462.4°F65.3°F62.4°F71.6°F
July 2565.1°F66°F63°F70.7°F
July 2664.2°F64.8°F63.5°F72°F
July 2764.2°F63.7°F63.5°F73.2°F
July 2865.1°F62.2°F62.2°F73.6°F
July 2966°F64.9°F62.2°F73.9°F
July 3066.2°F64.9°F64°F73.6°F
July 3166.9°F64.2°F64.2°F72.9°F
Boston Harbor Islands water temp chart in July

Average water temperature in Boston Harbor Islands in July over a decade

20162017201820192020
65.8°F64.9°F66.6°F68.5°F69.4°F
20212022202320242025
65.7°F64.4°F65.5°F64.8°F66°F

Boston Harbor Islands sea state in July

Chart comparing the height of waves in Boston Harbor Islands in July 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 Islands in July

Boston Harbor Islands 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 July?

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

AvrMinMax
Yirrell Beach66.2°F59.7°F73.9°F
Deer Island66.2°F59.7°F73.9°F
Adams Shore66.6°F59.7°F74.3°F
M Street Beach66.6°F59.7°F74.3°F
Constitution Beach66.4°F59.5°F74.7°F
Chelsea66.6°F59.5°F75°F
Winthrop66.2°F59.5°F74.7°F
Scituate66.2°F59.9°F72.3°F
Cohasset66.2°F59.9°F72.3°F
Sandy Beach66.2°F59.9°F72.3°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 Islands 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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