Port Julia, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Port Julia, South Australia, Australia, is known for its historic jetty and scenic coastal views. The best time to travel to Port Julia, Australia, is from 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!