Thongsala Koh Phangan, Thailand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thongsala Koh Phangan is known for its vibrant Full Moon Party. The best time to travel to Thongsala, Koh Phangan, Thailand, is from December to March, with average air temperatures around 27-30°C (81-86°F) and water temperatures around 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!