Arrowsmith, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Arrowsmith, Western Australia, Australia, is known for its proximity to the Arrowsmith River and the scenic landscapes of the Arrowsmith region. The best time to travel to Arrowsmith, Australia, is during the spring months of September to November, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!