The best time to go to Cornwall, Ontario, is during the summer months, from June to August, when the weather is warm and conducive to outdoor activities and local events.During this period, the average daily temperatures range from 20°C to 27°C (68°F to 81°F), making it great for exploring the city's parks, waterfront, and the Cornwall Canal Path. The extended daylight hours also mean more time for sightseeing and enjoying the natural beauty of the St. Lawrence River.Couples often find these months ideal for a relaxing getaway. You can enjoy strolls along the waterfront promenade, dine at outdoor patios, or take a scenic boat tour on the St. Lawrence River. The warm evenings are also great for experiencing local festivals or live music events that frequently take place in Lamoureux Park.Families will also appreciate the summer months, as many of Cornwall's attractions are geared towards outdoor enjoyment. The Aquatic Centre offers a refreshing escape on hot days, and the various splash pads and playgrounds within the city's parks provide entertainment for children.