Erdeven, France offers 1 beach perfect for sunbathing, surfing, swimming, and more. Erdeven is known for its megalithic sites, such as the Alignements de Kerzerho, and its beautiful beaches like Plage de Kerhillio. The best time to travel to Erdeven, France, is from June to September, when the average air temperature is around 18-22°C (64-72°F) and the water temperature is approximately 17-20°C (63-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!