Sei Lembu, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sei Lembu, South Kalimantan, Indonesia, is known for its proximity to the Meratus Mountains and the Loksado Bamboo Rafting experience. The best time to travel to Sei Lembu, 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!