Secret Harbour, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Secret Harbour is known for its Secret Harbour Beach, a popular destination for surfing and family-friendly activities. The best time to travel to Secret Harbour, Australia, is from 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!