Porthoustock, United Kingdom offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Porthoustock, England, United Kingdom, is known for its proximity to the Manacles, a popular diving site. The best time to travel to Porthoustock, United Kingdom, is during the summer months of June to August, when the average air temperature is around 18°C (64°F) and the sea temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!