Libby, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Libby, Montana, United States, is known for the Kootenai National Forest and the Cabinet Mountains Wilderness. The best time to travel to Libby, United States, is in July when the average air temperature is around 80°F (27°C) and the Kootenai River water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!