Unorganized Thunder Bay, Canada offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Unorganized Thunder Bay, Ontario, Canada, is known for its proximity to Sleeping Giant Provincial Park and the Terry Fox Monument. The best time to travel to Unorganized Thunder Bay, Canada, is in July 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!