Oya, Spain offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Oya The best time to travel to Oya, Spain, is from June to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 68-75°F (20-24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!