Tunkalilla, Australia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Tunkalilla, South Australia, Australia, is known for its proximity to the stunning Tunkalilla Beach and the scenic Heysen Trail. The best time to travel to Tunkalilla, 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 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!