Fannie Bay, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Fannie Bay, Northern Territory, Australia, is known for the Fannie Bay Gaol Museum and its scenic views of Fannie Bay Beach. The best time to travel to Fannie Bay, Australia, is during the dry season from May to September, when the average air temperature is around 25-30°C (77-86°F) and the water temperature is approximately 25°C (77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!