Summer (June-August): Peak tourist season with warm temperatures (20-27°C/68-81°F). Perfect for outdoor festivals, Toronto Islands, beaches, and patio dining. Expect crowds at major attractions and higher accommodation prices. Pros: Best weather, numerous festivals, outdoor activities. Cons: Crowded, expensive, humid.
Fall (September-November): Ideal visiting time with comfortable temperatures (10-20°C/50-68°F), fewer crowds, and spectacular fall foliage. September offers festival season continuation with pleasant weather. October showcases autumn colors in parks and ravines. Highly recommended for first-time visitors.
Winter (December-February): Cold temperatures (-5 to -1°C/23-30°F) with occasional snowstorms. Holiday season (December) features markets, ice skating, and festive lights. January-February offers lowest prices and authentic local experience. Underground PATH system connects downtown buildings. Pros: Winter festivals, lower prices, magical holiday atmosphere. Cons: Cold weather, shorter daylight hours.
Spring (March-May): Variable weather (5-18°C/41-64°F) with gradual warming. Late April-early May brings cherry blossoms to High Park. Shoulder season offers moderate prices and emerging outdoor activities. Pros: Spring blooms, moderate temperatures, fewer tourists. Cons: Unpredictable weather, some rain.
Best Overall: September-October for weather, crowds, and fall colors. Budget: January-March (excluding holidays). Festivals: June-September.