Santo Antonio, Portugal offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Santo Antonio, Azores, Portugal, is known for its proximity to the Sete Cidades Lakes and the stunning views from Vista do Rei. The best time to travel to Santo Antonio, Portugal, is from June to September, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!