Toronto weather in September
September in Toronto: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Toronto · #184 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Toronto climate normals — September
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 15°C / 59°F | |
| Feels like (high) | 21°C / 70°F | |
| Rainfall | 53 mm / 2.1 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Toronto in September — FAQ
- Is September a good time to visit Toronto?
- September in Toronto: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Toronto on SeasonMap's comfort score (86/100).
- What is the weather like in Toronto in September?
- In September, Toronto averages a daily high of 21.3°C and a low of 14.9°C, with about 53 mm of rain over roughly 7.6 rainy days.
- What is the air quality in Toronto in September?
- Toronto has a mean US Air Quality Index of about 48 in September.