Toronto Weather

About Toronto Weather

Toronto's weather is dominated by Lake Ontario's massive thermal influence — the lake moderates temperatures year-round, delaying spring warmth and extending autumn's mild stretch, while generating lake-effect snow on the lakeshore in winter. The city experiences cold, snowy winters with polar vortex intrusions and warm, humid summers. Toronto's downtown core has a growing urban heat island, while the Scarborough Bluffs and lakefront neighborhoods experience distinctly cooler and more maritime conditions.