Ormos Ysternion, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ormos Ysternion, South Aegean, Greece, is known for its picturesque harbor and proximity to the traditional village of Ysternia on the island of Tinos. The best time to travel to Ormos Ysternion, Greece, is from late May to early October, with average air temperatures ranging from 75°F to 85°F and water temperatures around 72°F to 78°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!