Sumlili, Indonesia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Sumlili is known for its pristine beaches and vibrant marine life, making it a hidden gem for beach tourism in East Nusa Tenggara, Indonesia. The best time to travel to Sumlili, Indonesia, is during the dry season from May to September, when the average air temperature is around 27-30°C (81-86°F) and the water temperature is approximately 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!