Umina Beach, Australia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Umina Beach is known for its beautiful beaches and proximity to the Bouddi National Park. The best time to visit Umina Beach, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures near 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!