The best time to visit Trois-Rivières depends on your preferences for weather and activities, but late spring to early autumn, specifically from June to September, generally offers the most pleasant conditions.During June, July, and August, the weather is at its warmest and sunniest, making it ideal for outdoor activities like exploring the city's historic district, walking along the Saint Lawrence River, or enjoying the parks. These months also see various festivals and events, adding to the city's appeal. For instance, the Grand Prix de Trois-Rivières, a major motorsport event, usually takes place in August.If you prefer slightly cooler temperatures and fewer crowds, September is an excellent choice. The autumn colours begin to emerge, particularly along the Mauricie region's scenic routes, offering beautiful landscapes. The weather remains pleasant enough for sightseeing without the peak summer heat.Winter, from December to March, transforms Trois-Rivières into a snowy landscape, offering opportunities for winter sports like ice skating or snowshoeing. However, temperatures can be very cold, and some attractions might have reduced hours.