Sumi, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sumi is known for its stunning beaches and vibrant marine life, making it a popular destination for beach tourism. The best time to travel to Sumba, Indonesia, is during the dry season from May to October, when the average air temperature is around 27-30°C (81-86°F) and the water temperature is approximately 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!