Toronto, Ontario weather in September

Averages from 2021–2025 (150 days of record).

Average high: 72°F
Average low: 58°F
Rainy days: ~8 per month
Total precipitation: 2.5 in
Warmest recorded: 89°F
Coldest recorded: 44°F

Expect September days in Toronto, Ontario to top out around 72°F and cool to about 58°F overnight, with roughly 8 days of measurable rain across the month. In recent years September has ranged from 44°F to 89°F.

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Current Toronto, Ontario forecast → · Historical data by Open-Meteo (ERA5).