Nankoku, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Muaro Sakai Inderapura is known for the Kerinci Seblat National Park, a UNESCO World Heritage Site. The best time to travel to Nankoku, Japan, is in April when the average air temperature is around 18°C (64°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!