Unionville, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Unionville is known for its proximity to Lake Lemon, a popular destination for beach and water activities. The best time to travel to Unionville, United States, is in late spring (May to June) when the average air temperature is around 65-75°F and water temperature is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!