Niagara on the Lake, Canada offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Niagara on the Lake is known for its Shaw Festival, historic sites, and wineries. The best time to visit Niagara on the Lake, Canada, is from June to August, when the average air temperature is around 70-80°F (21-27°C) and the water temperature in Lake Ontario is approximately 60-70°F (16-21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!