Tregastel, France offers 14 beaches perfect for sunbathing, surfing, swimming, and more. Tregastel is known for its stunning pink granite coast and beautiful beaches. The best time to travel to Tregastel, France, is from June to September, when the average air temperature is around 60-70°F (15-21°C) and the water temperature is approximately 60-65°F (16-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!