Lilli Pilli, Australia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Lilli Pilli, New South Wales, Australia, is known for its proximity to the Royal National Park and Port Hacking. The best time to travel to Lilli Pilli, 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!