Naval Base, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Naval Base, Western Australia, Australia, is known for its proximity to the historic Fremantle Prison and the vibrant Fremantle Markets. The best time to travel to Naval Base, Australia, is during the summer months of December to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!