MenduiOa, Spain offers 2 beaches perfect for sunbathing, surfing, swimming, and more. MenduiOa, Galicia, Spain, is known for its proximity to the stunning Ribeira Sacra wine region and the historic Monastery of San Esteban de Ribas de Sil. The best time to travel to MenduiOa, Spain, is in late spring or early fall when the average air temperature is around 70°F (21°C) and water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!