Sea Temperature in Dartmouth in September

© Slocum's River Reserve

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

Dartmouth Climate and Swimming Opportunities in September

Dartmouth lies within the Massachusetts in United States. The average daytime temperature in Dartmouth in September is 68°F (20°C), while the nighttime average is 50°F (10°C). There are typically nine rainy days during the month, with a total precipitation of 2.1 inches (55 mm). The daylight duration in September in Dartmouth 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 75%.

The water temperature in Dartmouth 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 66°F (19°C) in the last ten days. Overall, the average sea temperature in Dartmouth for September is 66°F (19°C). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Frequently Asked Questions About Water Temperatures in September in Dartmouth