Wiarton, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Wiarton is known for Wiarton Willie, the famous weather-predicting groundhog. The best time to travel to Wiarton, 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 Georgian Bay is approximately 15-20°C (59-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!