How cold is Cape Cod water in fall? In October sea water temperature throughout Cape Cod is not yet warm enough for swimming and does not exceed 68°F. Based on average water temperature observations over the past ten years, the warmest sea in Cape Cod in October was 62.1°F (in Quissett Beach), and the coldest water 58.3°F (in Truro). To find out the sea temperature today and in the coming days, go to Current sea temperature in Cape Cod
Cape Cod cities and resorts with the values of the average water temperature in October in recent years.
For more detailed information about water temperature, surf forecast, weather and time of sunrise and sunset in any specific area of your interest, just click on a city name. For ease of search, all places are also grouped by the first letter of the name.
To find out what the water temperature was in Cape Cod any day over a period of the last ten years, select the month