Tiwi Island, Australia offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Tiwi Island, Northern Territory, Australia, is known for its unique Aboriginal culture and the annual Tiwi Islands Football Grand Final and Art Sale. The best time to visit Tiwi Island, Australia, is during the dry season from May to September, with average air temperatures around 25-30°C (77-86°F) and water temperatures near 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!