The best time to go to St Catharines is during the late spring, summer, and early autumn months, from May to October, for the most pleasant weather and a full range of activities.May and June offer comfortable temperatures, usually in the high teens to low twenties Celsius. This period is ideal for exploring the numerous local wineries, as the vineyards are lush and green. It's also a great time for walking or cycling along the Waterfront Trail, which runs along Lake Ontario.July and August are the warmest months, with temperatures often reaching the mid to high twenties, great for enjoying the beaches at Port Dalhousie or exploring the Welland Canal Centre. Many outdoor festivals and events take place during this peak season, offering plenty of entertainment.September and October bring slightly cooler, crisp weather, with temperatures typically ranging from the mid-teens to low twenties. This is an excellent time for those who enjoy the vibrant autumn foliage, particularly along the Niagara Escarpment.