Myponga Beach, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Myponga Beach, South Australia, Australia, is known for the Myponga Reservoir and the scenic Myponga Beach itself. The best time to visit Myponga Beach, 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!