Mosteiros, Portugal offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Mosteiros, Azores, Portugal, is known for its stunning natural pools and the picturesque Mosteiros Beach. The best time to travel to Mosteiros, Portugal, is from June to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!