Carlyon Bay, United Kingdom offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Carlyon Bay is known for its picturesque beaches and the nearby Eden Project. The best time to travel to Carlyon Bay, United Kingdom, is from June to September, when the average air temperature is around 15-20°C (59-68°F) and the water temperature is approximately 15-17°C (59-63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!