Portmeirion, United Kingdom offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Portmeirion is known for its picturesque Italianate village designed by Sir Clough Williams-Ellis and its role as the filming location for the cult TV series "The Prisoner." The best time to visit Portmeirion, United Kingdom, is from June to August, with average air temperatures around 18°C (64°F) and water temperatures near 15°C (59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!