Castilla, Philippines offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Castilla, Bicol, Philippines, is known for the scenic views of the Mayon Volcano and the nearby Donsol Whale Shark Interaction Center. The best time to travel to Castilla, Philippines, is from December to May, with average air temperatures around 77-86°F (25-30°C) and water temperatures approximately 81°F (27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!