Water temperature in Barnstable in August

Is it warm enough to swim in Barnstable in August? Average water temperature in Barnstable in August is 71.1°F and therefore suitable for comfortable swimming. The warmest sea in Barnstable in August is 78.3°F, and the coldest is 64.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Barnstable

Changes water temperature in Barnstable in August 2025, 2024

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

Average water temperature in Barnstable in August over a decade

Chart comparing the height of waves in Barnstable in August 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.

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

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

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Our report for Barnstable 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.