Helena, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Helena is known for the Cathedral of Saint Helena and the Montana State Capitol. The best time to travel to Helena, 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 are typically around 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!