Arcachon, France offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Arcachon is known for the Dune of Pilat, the tallest sand dune in Europe. The best time to travel to Arcachon, France, is from June to September, when the average air temperature is around 70-80°F (21-27°C) and the water temperature is approximately 64-72°F (18-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!