Mawnan Smith, United Kingdom offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Mawnan Smith is known for its picturesque coastal walks and proximity to the subtropical gardens of Trebah and Glendurgan. The best time to travel to Mawnan Smith, United Kingdom, is from June to August, when the average air temperature is around 18°C (64°F) and the sea temperature is about 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!