Sea Temperature in Groton in September

© David Demers

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

Groton Climate and Swimming Opportunities in September

Groton lies within the Connecticut in United States. The average daytime temperature in Groton in September is 75°F (24°C), while the nighttime average is 57°F (14°C). There are typically nine rainy days during the month, with a total precipitation of 4.0 inches (101 mm). The daylight duration in September in Groton is 12 hours, with an average of 7 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 Groton in September ranges from 66°F to 70°F (19°C to 21°C). At the beginning of the month, the average temperature is around 70°F (21°C), shifting to 70°F (21°C) by mid-September and reaching 68°F (20°C) in the last ten days. Overall, the average sea temperature in Groton 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 Groton