Piriac sur Mer, France offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Piriac sur Mer is known for its charming medieval village, picturesque harbor, and beautiful beaches. The best time to travel to Piriac-sur-Mer, France, is from June to September, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!