Oia, Spain offers 36 beaches perfect for sunbathing, surfing, swimming, and more. Oia is known for its picturesque coastal views and the historic Monastery of Santa Maria de Oia. The best time to travel to Oia, 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!