Sea Temperature in Saint-Julien-en-Born in September

© Dominique Spriet

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

Saint-Julien-en-Born Climate and Swimming Opportunities in September

Saint-Julien-en-Born lies within the Nouvelle-Aquitaine in France. The average daytime temperature in Saint-Julien-en-Born in September is 23°C (74°F), while the nighttime average is 14°C (57°F). There are typically 10 rainy days during the month, with a total precipitation of 90 mm (3.6 inches). The daylight duration in September in Saint-Julien-en-Born is 12 hours, with an average of 6 hours of sunshine per day. The average wind speed in September is 11 km/h (7 mph), and the humidity level is around 75%.

The water temperature in Saint-Julien-en-Born in September ranges from 17°C to 21°C (63°F to 70°F). At the beginning of the month, the average temperature is around 21°C (70°F), shifting to 20°C (68°F) by mid-September and reaching 18°C (64°F) in the last ten days. Overall, the average sea temperature in Saint-Julien-en-Born for September is 20°C (68°F). 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 Saint-Julien-en-Born