Portsea, Australia offers 22 beaches perfect for sunbathing, surfing, swimming, and more. Portsea is known for the Portsea Pier, Point Nepean National Park, and the Portsea Hotel. The best time to travel to Portsea, Australia, is during the summer months of December to February, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!