Sea Temperature in Cape Cod in September

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Complete information on the sea temperature range in the Atlantic Ocean in Cape Cod in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Cape Cod. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Cape Cod Climate and Swimming Opportunities in September

Cape Cod lies within the Massachusetts in United States. The average daytime temperature in Cape Cod in September is 72°F (22°C), while the nighttime average is 58°F (14°C). There are typically nine rainy days during the month, with a total precipitation of 3.5 inches (89 mm). The daylight duration in September in Cape Cod is 12 hours, with an average of 7 hours of sunshine per day. The average wind speed in September is 11 mph (18 km/h), and the humidity level is around 76%.

The water temperature in Cape Cod in September ranges from 63°F to 70°F (17°C to 21°C). At the beginning of the month, the average temperature is around 68°F (20°C), shifting to 68°F (20°C) by mid-September and reaching 66°F (19°C) in the last ten days. Overall, the average sea temperature in Cape Cod for September is 68°F (20°C). Very comfortable swimming conditions. The water is fresh but not too cold, and the air temperature is pleasant.

Frequently Asked Questions About Water Temperatures in September in Cape Cod