Union City, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Union City, Pennsylvania, United States, is known for its historical significance and charming small-town atmosphere. The best time to travel to Union City, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the nearby water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!