Weather in Toronto in September 2025
Average weather
Average temperature in Toronto in September
The expected average maximum temperature in September is +23°C with a maximum of +33°C and a minimum of +8°C.
The average maximum temperature goes down 4% by the end of the month, compared with the beginning of the month, from +24°C to +23°C.
Is Toronto warm or cold in September?
Toronto is typically mild in September.
Maximum temperatures go down compared to the previous month from +25°C to +21°C. The minimum temperature also goes down from +18°C to +14°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Toronto:
Water temperature in Toronto in September
Water in Toronto in September is Fresh. It varies from +18°C to +23°C, with an average of +20°C. This is almost similar to the air temperature, which averages +21°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Toronto in September?
Climate in Toronto in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +25°C | +21°C | +14°C | ||||
| Min. temperature | ||||||
| +9°C | +3°C | -3°C | ||||
| Max. temperature | ||||||
| +35°C | +33°C | +30°C | ||||
| Rainfall | ||||||
| 68 mm | 81 mm | 93 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +22°C | +20°C | +14°C | ||||
| Humidity | ||||||
| 73% | 74% | 75% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 9 | 9 | 6 | ||||
| Cloudy days | ||||||
| 7 | 7 | 8 | ||||
| Rainy days | ||||||
| 11 | 12 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +25°C in the day, the average maximum temperature lowers to +21°C. Prepare for more rain. Average rainfall goes from 68 mm to 81 mm. Humidity rises from 73% to 74%. The average wind speed doesn’t change much during September, staying around 3 m/s. The amount of sunny days stay about the same, averaging 9 sunny days during the month.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Toronto is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Toronto?
Climate Change over Years
The climate in Toronto in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+11°C) and the highest in 2012 (+15°C). The driest year was 1994 with only 432 mm of rainfall, and the wettest year was 2023 with 1271 mm.
FAQ
Is September a good time to visit Toronto?
Can you sunbathe in Toronto in September?
Can you swim in Toronto in September?
Is Toronto rainy in September?
Is it sunny in Toronto in September?
Other cities in Canada
Monthly weather in Toronto
Source of the data
For this page, we’ve looked at the typical weather in Toronto, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.