Gasan, Philippines offers 14 beaches perfect for sunbathing, surfing, swimming, and more. Gasan is known for the Tres Reyes Islands, a popular tourist destination in the Philippines. The best time to travel to Gasan, Philippines, is from January to April, with average air temperatures around 27°C (81°F) and water temperatures near 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!