Le Chateau d Oleron, France offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Le Chateau d Oleron is known for its colorful oyster huts and the historic Chateau d'Oleron fortress. The best time to visit Le Chateau d'Oleron, France, is from June to September, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!