Ko Pha ngan, Thailand offers 16 beaches perfect for sunbathing, surfing, swimming, and more. Ko Pha ngan is known for the Full Moon Party. The best time to travel to Ko Pha Ngan, Thailand, is from December to March, with average air temperatures around 27°C (81°F) and water temperatures about 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!