Sleaford, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sleaford, South Australia, is known for its proximity to the stunning Lincoln National Park and the scenic Sleaford Bay. The best time to travel to Sleaford, Australia, is during the summer months of December to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!