MacTier, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. MacTier, Ontario, Canada, is known for its proximity to the Muskoka Lakes and the Georgian Bay Islands National Park. The best time to travel to MacTier, Canada, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature in nearby lakes is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!