Ontario weather in September 2019

  • 21°C maximum daytime temperature in September in Ontario (Toronto)21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Ontario (Toronto)10
    10 days with some rainfall
  • 11°C minimum night-time temperature in September in Ontario (Toronto)11
    11°C min night temperature
  • 12 hours of daylight per day in September in Ontario (Toronto)12
    12 hours of daylight per day
  • No heat & humidity in September in Ontario (Toronto)0
    No heat & humidity
  • 75 mm monthly rainfall in September in Ontario (Toronto)75
    75 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Ontario (Toronto)5
    5 (Moderate) UV index
  • 19°C sea temperature in September in Ontario (Toronto)19
    19°C sea temperature

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Expect 21°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Ontario in September. Check more long-term weather averages for Ontario in September before you book your next holiday to Ontario in 2019/2020. The September weather averages shown above are for Toronto.

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More about Ontario

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The September weather guide for Ontario, represented by Toronto, shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

Guide to Ontario weather in September

The average maximum daytime temperature in Ontario in September is a comfortable 21°C (70°F). The average night-time temperature is usually a cool 11°C (52°F). There are usually 6 hours of bright sunshine each day, which represents 48% of the 12 hours of daylight.

Expect 75mm (3.0 inches) of rainfall across the whole of September with 10 days with some rain falling. Maximum UV levels will be moderate (5 UV index) at midday when the skies are clear.

The average sea temperature in and around Ontario in September is 19°C (66°F).

The weather in Ontario in September is represented by Toronto.

Ontario sunrise & sunset times for September 2019

Browse the sunrise & sunset times for Ontario in September 2019. Select a month to view Ontario sunrise & sunset times for the next twelve months. The Ontario sunrise & sunset times shown below are for Toronto.


Date Sunrise times Sunset times
Sunday, 1st September 2019 06:41 19:53
Monday, 2nd September 2019 06:42 19:52
Tuesday, 3rd September 2019 06:43 19:50
Wednesday, 4th September 2019 06:44 19:48
Thursday, 5th September 2019 06:45 19:46
Friday, 6th September 2019 06:47 19:45
Saturday, 7th September 2019 06:48 19:43
Sunday, 8th September 2019 06:49 19:41
Monday, 9th September 2019 06:50 19:39
Tuesday, 10th September 2019 06:51 19:37
Wednesday, 11th September 2019 06:52 19:36
Thursday, 12th September 2019 06:53 19:34
Friday, 13th September 2019 06:54 19:32
Saturday, 14th September 2019 06:56 19:30
Sunday, 15th September 2019 06:57 19:28
Monday, 16th September 2019 06:58 19:26
Tuesday, 17th September 2019 06:59 19:25
Wednesday, 18th September 2019 07:00 19:23
Thursday, 19th September 2019 07:01 19:21
Friday, 20th September 2019 07:02 19:19
Saturday, 21st September 2019 07:03 19:17
Sunday, 22nd September 2019 07:04 19:15
Monday, 23rd September 2019 07:06 19:13
Tuesday, 24th September 2019 07:07 19:12
Wednesday, 25th September 2019 07:08 19:10
Thursday, 26th September 2019 07:09 19:08
Friday, 27th September 2019 07:10 19:06
Saturday, 28th September 2019 07:11 19:04
Sunday, 29th September 2019 07:12 19:03
Monday, 30th September 2019 07:14 19:01
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Popular Ontario destinations

Below are average maximum temperatures at popular destinations in Ontario in September. Select a destination to see more weather parameters.

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