Shellharbour, Australia offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Shellharbour is known for Killalea State Park and the Shellharbour Village. The best time to travel to Shellharbour, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures near 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!