Denman Island, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Denman Island is known for its natural beauty, including Boyle Point Provincial Park and Fillongley Provincial Park, as well as its vibrant arts community and the annual Denman Island Readers and Writers Festival. The best time to travel to Denman Island, Canada, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!