Ko Pha-Ngan Sub-District, Thailand offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Ko Pha-Ngan Sub-District is known for the Full Moon Party. The best time to travel to Ko Pha-Ngan Sub-District, 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!