Lutan, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Lutan, East Kalimantan, Indonesia, is known for the Kutai National Park and the Mahakam River. The best time to travel to Lutan, Indonesia, is from May to September, with average air temperatures around 27°C (81°F) and water temperatures near 29°C (84°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!