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Water temperature in Boston Harbor Islands (MA) in April

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Is it warm enough to swim in Boston Harbor Islands in April? Average water temperature in Boston Harbor Islands in April is 43.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Boston Harbor Islands in April is 49.5°F, and the coldest is 36.7°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 April 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 April.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
April 142.1°F41.2°F36.7°F43.5°F
April 241.4°F41.5°F37°F43.9°F
April 341.2°F41.4°F37.2°F43.3°F
April 441.5°F41°F37.4°F44.6°F
April 541.9°F41.2°F37.8°F43.7°F
April 641.7°F41°F37.9°F44.2°F
April 741.5°F40.6°F37.9°F44.8°F
April 842.3°F41.5°F37.9°F45.1°F
April 942.3°F43°F37.8°F45.3°F
April 1041.9°F43°F38.1°F45.3°F
April 1141.5°F42.6°F38.8°F45°F
April 1241.4°F44.8°F39.6°F45.5°F
April 1341.4°F44.4°F40.1°F46.9°F
April 1441.4°F44.1°F40.6°F46.2°F
April 1543.5°F44.6°F41.2°F47.5°F
Day 2025 2024 Min Max
April 1642.8°F46.8°F41.2°F48.6°F
April 1743.9°F46.6°F41°F49.1°F
April 1843°F46.4°F41°F48.6°F
April 1943.2°F46.2°F41°F48.7°F
April 2045°F46.8°F41°F48.9°F
April 2144.6°F46.2°F42.1°F49.3°F
April 2245°F46.9°F42.8°F49.1°F
April 2346.4°F46.6°F42.8°F48.4°F
April 2447.3°F45.7°F42.4°F49.5°F
April 2546.8°F45.5°F42.4°F49.3°F
April 2646.6°F45.7°F42.4°F48.9°F
April 2746.6°F45.5°F42.6°F49.5°F
April 2846.6°F45.7°F42.8°F49.1°F
April 2947.3°F47.3°F42.6°F48.9°F
April 3047.8°F46.9°F42.8°F48.6°F
Boston Harbor Islands water temp chart in April

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

20162017201820192020
43.9°F43.7°F42.4°F43.9°F44.1°F
20212022202320242025
45.7°F45.5°F45.7°F44.4°F43.7°F

Boston Harbor Islands sea state in April

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

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 April?

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

AvrMinMax
Yirrell Beach43.7°F36.7°F49.5°F
Deer Island43.7°F36.7°F49.5°F
Adams Shore43.9°F36.9°F50°F
M Street Beach43.9°F36.9°F50°F
Constitution Beach43.9°F36.9°F50.2°F
Chelsea43.9°F36.9°F50.2°F
Winthrop43.7°F36.9°F50.2°F
Scituate43.5°F36.7°F49.3°F
Cohasset43.5°F36.7°F49.3°F
Sandy Beach43.5°F36.7°F49.3°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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