Koto Nan Duo IV Koto Hilie, Indonesia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Koto Nan Duo IV Koto Hilie, West Sumatra, Indonesia, is known for its proximity to the Harau Valley and the traditional Minangkabau architecture. The best time to travel to Koto Nan Duo IV Koto Hilie, Indonesia, is from May to September, with average air temperatures around 27-30°C (81-86°F) and water temperatures around 28-29°C (82-84°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!