Santo Isidoro, Portugal offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Santo Isidoro is known for its stunning beaches and relaxed coastal atmosphere. The best time to travel to Santo Isidoro, Portugal, is from late spring to early autumn (May to September), when the average air temperature ranges from 20°C to 28°C (68°F to 82°F) and the average sea temperature is around 18°C to 21°C (64°F to 70°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!