Batz sur Mer, France offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Batz sur Mer is known for its scenic coastline, the Grand Blockhaus Museum, and the Saint-Guénolé Tower. The best time to travel to Batz sur Mer, France, is from June to September, with average air temperatures around 18-22°C (64-72°F) and water temperatures around 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!