Iona, United Kingdom offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Iona, Scotland, United Kingdom, is known for the Iona Abbey and its historical significance as a center of early Christianity. The best time to travel to Iona, United Kingdom, is from May to September, with average air temperatures around 12-16°C (54-61°F) and water temperatures around 11-14°C (52-57°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!