Saint Agnes, United Kingdom offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Saint Agnes is known for its stunning coastal scenery, including the iconic Wheal Coates tin mine and Chapel Porth beach. The best time to travel to Saint Agnes, 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!