Clarence, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Clarence, Missouri, United States, is known for the Clarence Cannon National Wildlife Refuge. The best time to travel to Clarence, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F (21-27°C) and water temperature in nearby lakes is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!