Pentraeth, United Kingdom offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Pentraeth is known for its proximity to Red Wharf Bay and the historic St. Mary's Church. The best time to travel to Pentraeth, United Kingdom, is from June to August, with average air temperatures around 15-20°C (59-68°F) and water temperatures around 14-17°C (57-63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!