Sao Felix da Marinha, Portugal offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Sao Felix da Marinha is known for its beautiful beaches and proximity to the vibrant city of Porto. The best time to travel to São Félix da Marinha, Portugal, is from June to September, when the average air temperature ranges from 20°C to 25°C (68°F to 77°F) and the average sea temperature is around 18°C to 20°C (64°F to 68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!