As Sinas, Spain offers 1 beach perfect for sunbathing, surfing, swimming, and more. As Sinas, Galicia, Spain, is known for its proximity to the Rias Baixas and the scenic beaches along the Atlantic coast. The best time to travel to As Sinas, Spain, is during late spring to early summer (May to June), when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 16-20°C (61-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!