Ko Phayam, Thailand offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Ko Phayam, Ranong, Thailand, is known for its serene beaches like Ao Yai and Ao Kao Kwai, as well as its vibrant marine life and laid-back atmosphere. The best time to travel to Ko Phayam, Thailand, is from November to February, with average air temperatures around 28°C (82°F) and water temperatures about 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!