Montana City, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Montana City is known for its proximity to the Helena National Forest and the Gates of the Mountains Wilderness. The best time to travel to Montana City, United States, is in late spring or early fall when the average air temperature is around 60-70°F and water temperatures in nearby lakes and rivers are approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!