Mazarefes, Portugal offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mazarefes, Viana do Castelo, Portugal, is known for its proximity to the historic city of Viana do Castelo and the scenic Lima River. The best time to travel to Mazarefes, Portugal, is from June to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 64-72°F (18-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!