Saint Pierre d Oleron, France offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Saint Pierre d Oleron is known for the Chateau d'Oleron, the Oleron Island Lighthouse, and the Marais aux Oiseaux. The best time to travel to Saint Pierre 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!