Mount Martha, Australia offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Mount Martha is known for its stunning beaches, particularly South Beach, and the scenic Mount Martha Park. The best time to travel to Mount Martha, 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!