Mount Juliet, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mount Juliet, Tennessee, United States, is known for the Charlie Daniels Park and the proximity to the scenic Percy Priest Lake. The best time to travel to Mount Juliet, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the nearby water temperature in Percy Priest Lake 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!