Sea Temperature in Carnac in September

© Christine Coursant

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

Carnac Climate and Swimming Opportunities in September

Carnac lies within the Brittany in France. The average daytime temperature in Carnac in September is 20°C (67°F), while the nighttime average is 14°C (56°F). There are typically 10 rainy days during the month, with a total precipitation of 59 mm (2.3 inches). The daylight duration in September in Carnac is 12 hours, with an average of 6 hours of sunshine per day. The average wind speed in September is 17 km/h (11 mph), and the humidity level is around 81%.

The water temperature in Carnac in September ranges from 16°C to 19°C (61°F to 66°F). At the beginning of the month, the average temperature is around 18°C (64°F), shifting to 18°C (64°F) by mid-September and reaching 17°C (63°F) in the last ten days. Overall, the average sea temperature in Carnac for September is 18°C (64°F). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Frequently Asked Questions About Water Temperatures in September in Carnac