Cowell, Australia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Cowell, South Australia, Australia, is known for its Franklin Harbour, renowned for oyster farming and scenic coastal views. The best time to travel to Cowell, Australia, is from December to February, with average air temperatures around 25-30°C (77-86°F) and water temperatures approximately 20-22°C (68-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!