Casian, Philippines offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Casian, MIMAROPA, Philippines, is known for its proximity to the stunning natural beauty of the Calamian Islands and the vibrant marine life of the surrounding waters. The best time to travel to Casian, Philippines, is from December to May, with average air temperatures around 77-86°F (25-30°C) and water temperatures approximately 79-84°F (26-29°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!