Ko Lanta, Thailand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ko Lanta, Krabi, Thailand, is known for its stunning beaches, vibrant marine life, and relaxed island atmosphere. The best time to travel to Ko Lanta, Thailand, is from November to April, with average air temperatures around 28-32°C (82-90°F) and water temperatures around 27-30°C (81-86°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!