Mundam, Indonesia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Mundam, Riau, Indonesia, is known for its proximity to the Siak River and the cultural heritage of the Riau Malay community. The best time to travel to Mundam, 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!