Susanville, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Susanville is known for the Lassen Volcanic National Park and the Bizz Johnson Trail. The best time to travel to Susanville is in late spring (May to June) when the average air temperature is around 60-75°F and water temperatures in nearby lakes 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!