Porto, Portugal offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Porto is known for its stunning Douro River views and historic architecture rather than beach tourism. The best time to travel to Porto, Portugal, is from May to September, when the average air temperature ranges from 20°C to 25°C (68°F to 77°F) and the average water 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!