Seal Bay, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Seal Bay, South Australia, Australia, is known for the Seal Bay Conservation Park where visitors can observe Australian sea lions in their natural habitat. The best time to visit Seal Bay, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures near 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!