Manna, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Manna, Bengkulu, Indonesia, is known for the Bukit Kaba volcano and the beautiful beaches along the Indian Ocean. The best time to travel to Manna, Indonesia, is from May to September, with average air temperatures around 27°C (81°F) and water temperatures near 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!