Sea Temperature in Boston in September

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

Boston Climate and Swimming Opportunities in September

Boston lies within the Massachusetts in United States. The average daytime temperature in Boston in September is 72°F (22°C), while the nighttime average is 55°F (13°C). There are typically nine rainy days during the month, with a total precipitation of 3.6 inches (92 mm). The daylight duration in September in Boston is 12 hours, with an average of 8 hours of sunshine per day. The average wind speed in September is 9 mph (14 km/h), and the humidity level is around 73%.

The water temperature in Boston in September ranges from 61°F to 66°F (16°C to 19°C). At the beginning of the month, the average temperature is around 66°F (19°C), shifting to 66°F (19°C) by mid-September and reaching 63°F (17°C) in the last ten days. Overall, the average sea temperature in Boston for September is 64°F (18°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 Boston