Siasi, Philippines offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Siasi is known for its vibrant Sama-Bajau culture and the picturesque Siasi Island. The best time to travel to Siasi, Philippines, is from December to May, with average air temperatures around 27-30°C (81-86°F) and water temperatures approximately 28-30°C (82-86°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!