Waikiki, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Waikiki, Western Australia, Australia, is known for its proximity to Rockingham Beach and Penguin Island. The best time to travel to Waikiki, Australia, is from December to February, with average air temperatures around 75-85°F (24-29°C) and water temperatures around 72-77°F (22-25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!