Ko Yao Yai, Thailand offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Ko Yao Yai is known for its serene beaches and tranquil atmosphere, offering a peaceful escape from the bustling tourist spots. The best time to travel to Ko Yao Yai, Thailand, is from November to February, with average air temperatures around 28°C (82°F) and water temperatures near 29°C (84°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!