Sheaoak Flat, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sheaoak Flat, South Australia, Australia, is known for its proximity to the scenic Yorke Peninsula and the nearby Innes National Park. The best time to travel to Sheaoak Flat, Australia, is during the summer months of December to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 21°C (70°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!