Blacks Harbour, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Blacks Harbour is known for being the gateway to Grand Manan Island. The best time to travel to Blacks Harbour, 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 12°C (54°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!