September weather forecast
Toronto, Canada

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

The first month of the autumn, September, is still a pleasant month in Toronto, Canada, with average temperature fluctuating between 15°C (59°F) and 20.9°C (69.6°F).

Temperature

In Toronto, the average high-temperature in September marginally drops, from a moderately hot 24.5°C (76.1°F) in August, to an agreeable 20.9°C (69.6°F). The average low-temperature,, is 15°C (59°F).

Humidity

Months with the lowest humidity are August and September, with an average relative humidity of 74%.

Rainfall

In Toronto, Canada, during September, the rain falls for 12.2 days and regularly aggregates up to 28mm (1.1") of precipitation. In Toronto, during the entire year, the rain falls for 136.8 days and collects up to 420mm (16.54") of precipitation.

Snowfall

May through October are months without snowfall in Toronto.

Sea temperature

In Toronto, the average water temperature is 20.1°C (68.2°F).
Note: For swimming, a surface water temperature of 20.1°C (68.2°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

The average length of the day in September is 12.5h.

Sunshine

In September, the average sunshine is 9.4h.

UV index

The average daily maximum UV index in Toronto is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the least humid month in Toronto?

Months with the lowest humidity in Toronto, Canada, are August and September, with an average relative humidity of 74%.

What is the average humidity in September in Toronto?

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

How many days does it rain in September in Toronto?

In Toronto, Canada, in September, it is raining for 12.2 days, with typically 28mm (1.1") of accumulated precipitation.

When it does not snow in Toronto?

In Toronto 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 (68.2°F). For most, swimming in 20.1°C (68.2°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

How many hours of daylight does Toronto have in September?

In Toronto, Canada, the average length of the day in September is 12.5h.

How long on average sun shines in September in Toronto?

In September, the average sunshine is 9.4h.

How high is the UV index in September in Toronto?

In Toronto, Canada, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

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

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%

Months with the highest relative humidity are January and February (83%).
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).
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).
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: 12.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is January (Average sunshine: 3.2h).

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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

Months with the highest UV index are July and August (UV index 6).
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

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

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