Mullion, United Kingdom offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Mullion is known for the Mullion Cove, Lizard Peninsula, and South West Coast Path. The best time to travel to Mullion, United Kingdom, is during late spring to early autumn (May to September) when the average air temperature is around 15-20°C (59-68°F) and the sea temperature is approximately 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!