Nanjo, Japan offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Nanjo, Kyushu, Japan, is known for the Sefa-utaki, a sacred site and UNESCO World Heritage location. The best time to travel to Nanjo, Japan, is from April to June, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 22-25°C (72-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!