Sundar, Malaysia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sundar, Sarawak, Malaysia, is known for the Gunung Mulu National Park, a UNESCO World Heritage Site. The best time to travel to Sundar, Malaysia, is between March and October, with average air temperatures around 28°C (82°F) and water temperatures near 30°C (86°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!