The best time to visit Carnarvon, Ontario, is during the summer months, from June to August, or in the autumn, specifically September and October.Summer offers the warmest weather, with average temperatures around 20-25°C, making it ideal for enjoying the numerous lakes and outdoor activities. This is peak season for cottaging, boating, and swimming, with long daylight hours great for exploring the surrounding natural beauty of the Algonquin Highlands.For those who appreciate stunning natural scenery and cooler temperatures, autumn is an excellent choice. The region is famous for its vibrant fall foliage, typically peaking in late September or early October.