Isle of Colonsay, United Kingdom offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Isle of Colonsay is known for the Colonsay House Gardens and the annual Colonsay Book Festival. The best time to travel to the Isle of Colonsay is from May to September, with average air temperatures ranging from 12°C to 16°C and water temperatures around 11°C to 14°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!