Andernos les Bains, France offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Andernos les Bains is known for its picturesque Arcachon Bay, the longest pier in France, and the Church of Saint-Eloi. The best time to travel to Andernos les Bains, 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 68-72°F (20-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!