Marmari, Greece offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Marmari is known for its proximity to the stunning beaches of Kos and the ancient ruins of Asklepion. The best time to travel to Marmari, 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!