Sundarban, Bangladesh offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sundarban, Khulna, Bangladesh, is known for the Sundarbans Mangrove Forest, the largest mangrove forest in the world and a UNESCO World Heritage Site. The best time to travel to Sundarban, Bangladesh, is from November to February, with average air temperatures around 20-25°C (68-77°F) and water temperatures approximately 20-23°C (68-73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!