Santo Tomas, Philippines offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Santo Tomas, Ilocos Region, Philippines, is known for the Agoo-Damortis National Seashore Park. The best time to travel to Santo Tomas, Philippines, is from December to February, with average air temperatures around 77-86°F (25-30°C) and water temperatures near 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!