Viannos, Greece offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Viannos is known for the Amiras Memorial dedicated to the victims of the Viannos massacres during World War II. The best time to travel to Viannos, Greece, is from May to October, with average air temperatures ranging from 70°F to 85°F and sea temperatures from 70°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!