Hallett Cove, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hallett Cove, South Australia, Australia, is known for the Hallett Cove Conservation Park, which features the unique geological formations of the Sugarloaf and ancient glacial pavements. The best time to travel to Hallett Cove, 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 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!