Sydney Mines, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sydney Mines is known for the Cape Breton Fossil Centre and its rich coal mining history. The best time to travel to Sydney Mines, 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 15°C (59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!