Ontario - Canada weather in September 2025
Ontario - Canada weather in September 2025
Day
22 °C
Night
11 °C
Sea
13 °C
Precipitation
81 mm
in month
Rainy days
11 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
76 %
Day
22 °C
Night
11 °C
Sea
13 °C
Precipitation
81 mm
in month
Rainy days
11 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
76 %
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Weather overview and FAQs
Weather overview
In September in Ontario, the average air temperature ranges from 22 °C (71 °F) during the day to 11 °C (53 °F) at night. There are 11 days of rain on average, where the rainfall is 81 mm (3.20 in).
Are there good conditions to visit in September in Ontario?
There are good conditions for visiting in September in Ontario. There are some people, who may feel a slight chill at 22 °C (71 °F), but others will feel perfectly fine. The temperature of 11 °C (53 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
What temperature can I expect during the day in Ontario in September?
In Ontario in September, the average daily temperatures will be 22 °C (71 °F). A comfortable temperature for most people, where it is neither too cold nor too hot, and a large number of activities can be carried out comfortably, including sunbathing by the water. Lighter clothing will be suitable - shorts, skirts, t-shirts, jackets; a light sweater and long trousers may also be useful.
How many days of precipitation on average can I expect in Ontario in September?
There are 11 days, which are rainy in Ontario in September, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 2.5 days of the week, or in general - 36 % days.
How heavy is the precipitation in September in Ontario?
In Ontario in September, there is 81 mm (3.20 in) rainfall, which means on average 3 mm (0.11 in) rainfall per day.
How long is the day (from dawn till dusk) in Ontario in September?
The length of daylight in Ontario in September is 12 hours.
What is the night temperature in September in Ontario?
The average night temperature in Ontario in September is 11 °C (53 °F). Nights can be cooler, morning running can be refreshing but choose appropriate clothing, evening outdoor sitting can be pleasant but you can also be cold.
Is there a wet season in September in Ontario?
No, there is no wet season in September in Ontario - you can expect 11 days of rain during the month.
Is September part of the dry season in Ontario?
No, September is not a dry month in Ontario, expect rain approximately 11 days in a month.
How many hours of sun to expect in September in Ontario?
There is an average length of sunshine of 6 hours per day in September in Ontario.
Is Ontario rainier in September than in October?
No, in Ontario in September it does not rain more than in October.
How windy is Ontario in September?
An average wind scale that can be expected in Ontario in September is 3.
What is the humidity in Ontario in September?
Humidity in Ontario in September is 76 %.
Is the temperature rising or falling in the course of time in September in Ontario?
During September in Ontario, the day temperatures are decreasing - from 24 °C (75 °F) at the beginning of the month to 18 °C (64 °F) at the end of the month.
Is the weather in Ontario warmer in September than in August?
No, in Ontario in September the temperature is not higher than in August.