Mill Bay, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mill Bay is known for the Brentwood College School and the Mill Bay Ferry Terminal. The best time to travel to Mill Bay, 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!