Sea Temperature in Plymouth in September

© Zeljko Mikulic

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

Plymouth Climate and Swimming Opportunities in September

Plymouth lies within the Massachusetts in United States. The average daytime temperature in Plymouth 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 Plymouth 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 Plymouth in September ranges from 64°F to 68°F (18°C to 20°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 64°F (18°C) in the last ten days. Overall, the average sea temperature in Plymouth for September is 66°F (19°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 Plymouth