Tiffin, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tiffin, Iowa, United States, is known for its proximity to the University of Iowa and the Coralville Lake. The best time to travel to Tiffin, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and water temperature is not a significant factor due to the lack of large bodies of water. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!