Plummer Additional, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Plummer Additional is known for its proximity to the scenic Lake Huron and the historic Bruce Mines. The best time to travel to Plummer Additional, Canada, is during the summer months of June to August, when the average air temperature is around 68°F (20°C) and water temperature is approximately 64°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!