Gunlock, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gunlock, Utah, United States, is known for Gunlock State Park and its picturesque reservoir. The best time to travel to Gunlock, United States, is in late spring (May), when the average air temperature is around 75°F (24°C) and water temperature 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!