Mosman, Australia offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Mosman is known for Taronga Zoo, Balmoral Beach, and the Sydney Harbour National Park. The best time to travel to Mosman, Australia, is from November to April, with average air temperatures ranging from 68°F to 79°F (20°C to 26°C) and water temperatures around 72°F to 77°F (22°C to 25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!