Nisyros, Greece offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Nisyros is known for its active volcano, the Stefanos Crater, and the charming village of Mandraki. The best time to travel to Nisyros, Greece, is from May to October, with average air temperatures ranging from 70°F to 85°F and water temperatures from 70°F to 77°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!