September weather forecast
Toronto, Canada

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Colorfully lit night city of Toronto, Canada, with a view of the Nathan Phillips Square, and a large Toronto sign
Colorfully lit night city of Toronto, Canada, with a view of the Nathan Phillips Square, and a large Toronto sign

Weather in September

As September comes around, temperatures start to cool down, signifying the onset of fall in Toronto. The city goes through a picturesque transformation with leaves turning crisp and colourful. Cultural events, notably the Toronto International Film Festival, make this month quite vibrant. Public places like High Park and the Toronto Zoo offer a peaceful environment for admiring the fall foliage. In the evenings, expect a mild chill in the air indicating that it's time for light sweaters.

Temperature

September in Toronto, Canada, reveals a small adjustment in temperature, transitioning from an average high of a warm 24.5°C in August to a pleasant 20.9°C. Toronto, during the nights of September, experiences an average temperature drop to a refreshing 15°C.

Humidity

August and September, with an average relative humidity of 74%, are the least humid months.

Rainfall

In September, in Toronto, the rain falls for 12.2 days. Throughout September, 28mm of precipitation is accumulated. Throughout the year, there are 136.8 rainfall days, and 420mm of precipitation is accumulated.

Snowfall

In Toronto, snow does not fall in May through October.

Sea temperature

In Toronto, the average seawater temperature in September is 20.1°C.
Note: For most, swimming in 20.1°C is not a pleasant activity. Breathing becomes increasingly challenging as water temperature descends from 21°C to 15°C.

Daylight

In Toronto, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:41 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:01 pm EDT.

Sunshine

The average sunshine in September in Toronto, Canada, is 9.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 4 in September translates into these instructions:
Ensure safety - Imperative it is to shield skin and eyes from damage. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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FAQ

What are September temperatures in Toronto?

September temperatures in Toronto vary between a high-temperature of 20.9°C and a low-temperature of 15°C.

What are the least humid months in Toronto?

August and September, with an average relative humidity of 74%, are the least humid months in Toronto.

What is the average humidity in September in Toronto?

In Toronto, the average relative humidity in September is 74%.

How much does it rain in Toronto in September?

In Toronto, during September, the rain falls for 12.2 days and regularly aggregates up to 28mm of precipitation.

When it does not snow in Toronto?

In Toronto, Canada, snow does not fall in May through October.

What is the sea temperature in September in Toronto?

In September, the average sea temperature in Toronto, Canada, is 20.1°C. For most, swimming in 20.1°C is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C to 15°C.

How many hours of daylight does Toronto have in September?

In September, the average day length is 12h and 29min.

What time are sunrise and sunset in September in Toronto?

In September, on the first day of the month, sunrise is at 6:41 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:01 pm EDT.

How long on average sun shines in September in Toronto?

In Toronto, the average sunshine duration in September is 9.4h.

How high is the UV index in September in Toronto?

The average daily maximum UV index in September in Toronto is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Toronto, Canada

Average temperature in September - Toronto, Canada
  • Average high temperature in September: 20.9°C

The warmest month (with the highest average high temperature) is July (24.8°C).
The month with the lowest average high temperature is January (-2.3°C).

  • Average low temperature in September: 15°C

The months with the highest average low temperature are July and August (18.4°C).
The coldest month (with the lowest average low temperature) is January (-7°C).

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Average pressure in September
Toronto, Canada

Average pressure in September - Toronto, Canada
  • Average pressure in September: 1017mbar

The month with the highest atmospheric pressure is March (1018.4mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).

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Average wind speed in September
Toronto, Canada

Average wind speed in September - Toronto, Canada
  • Average wind speed in September: 13.9km/h

The windiest month (with the highest average wind speed) is January (19.5km/h).
The calmest month (with the lowest average wind speed) is July (11.7km/h).

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Average humidity in September
Toronto, Canada

Average humidity in September - Toronto, Canada
  • Average humidity in September: 74%

The months with the highest relative humidity are January and February (83%).
The months with the lowest relative humidity are August and September (74%).

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Average rainfall in September
Toronto, Canada

Average rainfall in September - Toronto, Canada
  • Average rainfall in September: 28mm

The wettest month (with the highest rainfall) is July (53mm).
The driest month (with the least rainfall) is February (19mm).

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Average rainfall days in September
Toronto, Canada

Average rainfall days in September - Toronto, Canada
  • Average rainfall days in September: 12.2 days

The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is February (5.6 days).

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Average snowfall in September
Toronto, Canada

Average snowfall in September - Toronto, Canada
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (57mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in September
Toronto, Canada

Average snowfall days in September - Toronto, Canada
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Toronto, Canada

Average sea temperature in September - Toronto, Canada
  • Average sea temperature in September: 20.1°C

The best month for swimming (with the highest average sea temperature) is August (22.3°C).
The coldest month (with the lowest average sea temperature) is March (1.9°C).

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Average daylight in September /
Average sunshine in September
Toronto, Canada

Average daylight in September / Average sunshine in September - Toronto, Canada
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

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Average sunshine days in September
Toronto, Canada

Average sunshine days in September - Toronto, Canada
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is March (16.2 days).
The month with the least sunshine days is July (12.8 days).

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Average UV index in September
Toronto, Canada

Average UV index in September - Toronto, Canada
  • Average UV index in September: 4

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Toronto, Canada

Average cloud cover in September - Toronto, Canada
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in September
Toronto, Canada

Average visibility in September - Toronto, Canada
  • Average visibility in September: 10km

The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, November and December (9km).

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Toronto, Canada

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