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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the BuzzLayer Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
September in Toronto brings a noticeable shift from summer warmth to early-autumn cool, with average highs around 21°C and lows near 13°C. The live forecast above shows how this week’s conditions compare to the seasonal norm for Canada’s largest city.
What is the typical temperature range for Toronto in September?
Daytime highs in September usually sit between 18°C and 24°C, while overnight lows fall to 10°C–15°C. The weather in Toronto in September in Celsius works out to a monthly mean of roughly 16°C — comfortable for patio lunches but cool enough for a light jacket after sunset. For those accustomed to the toronto weather september fahrenheit scale, that’s about 61°F as a monthly average, with afternoons often reaching the low 70s°F.
How much rain and sun does Toronto see in September?
The city averages about 75 millimetres of precipitation across 10–12 rainy days in September, so you’ll still get plenty of sunshine between passing systems. Humidity drops compared with July and August, making it one of the more pleasant months for walking the lakeshore or visiting the Toronto weather page for daily updates. Up north, the september weather muskoka region turns cooler and crisper, with colour starting to show in the maples.
Does Toronto get frost in September?
Frost is rare in September across Toronto proper, though the first chilly mornings can dip near 5°C by the final week. The official first frost usually arrives in October, and the toronto weather in october outlook often shows a sharper drop in temperatures.
Is September a good month to visit Toronto?
Yes — September offers mild days, lower humidity, and fewer crowds than peak summer. The weather in canada in september in celsius varies by region, but Toronto’s blend of 21°C highs and urban events like TIFF makes it a top pick for travellers.
How does September compare to other months?
September is warmer than October but cooler than June, sitting in a sweet spot between seasons. For historical weather toronto september records, the city has seen extremes from 36°C to 3°C, but most days fall into the comfortable mid-range described above.