Ormos Isternion, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ormos Isternion is known for its picturesque beaches and traditional Cycladic architecture. The best time to travel to Ormos Isternion, Greece, is from late May to early October, with average air temperatures ranging from 75-85°F (24-29°C) and water temperatures around 73-79°F (23-26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!