Milsons Passage, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Milsons Passage, New South Wales, Australia, is known for its proximity to the scenic Hawkesbury River and the Ku-ring-gai Chase National Park. The best time to travel to Milsons Passage, Australia, is during the late spring to early autumn (November to March) when the average air temperature is around 20-30°C (68-86°F) and the water temperature is approximately 22-26°C (72-79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!