Coana, Spain offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Coana is known for the Castro de Coana, an ancient hill fort that is a significant archaeological site in Asturias. The best time to travel to Coana, Spain, is during late spring to early autumn (May to September) when the average air temperature ranges from 60°F to 75°F and the water temperature is around 60°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!