Appin, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Appin, Scotland, United Kingdom, is known for its stunning natural landscapes and historical sites, including Castle Stalker. The best time to travel to Appin, United Kingdom, is from June to August, when the average air temperature is around 15-18°C (59-64°F) and the water temperature is approximately 12-14°C (54-57°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!