Semaphore Park, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Semaphore Park, South Australia, Australia, is known for its proximity to Semaphore Beach and the historic Semaphore Jetty. The best time to travel to Semaphore Park, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures about 21°C (70°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!