Brereton Lake, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Brereton Lake is known for Whiteshell Provincial Park. The best time to travel to Brereton Lake, 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 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!