Castaways Beach, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Castaways Beach, Queensland, Australia, is known for its proximity to Noosa National Park and the scenic Sunshine Coast. The best time to travel to Castaways Beach, Australia, is from September to November, with average air temperatures around 20-25°C (68-77°F) and water temperatures about 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!