Bigfork, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Bigfork, Montana, United States, is known for the Flathead Lake, the Bigfork Summer Playhouse, and the Jewel Basin Hiking Area. The best time to travel to Bigfork, United States, is in July when the average air temperature is around 80°F (27°C) and the water temperature in nearby Flathead Lake is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!