Clam Harbour, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Clam Harbour is known for the Clam Harbour Beach Sandcastle Competition. The best time to travel to Clam Harbour, Canada, is in July and August when the average air temperature is around 20°C (68°F) and the water temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!