Toronto weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Toronto in September. Check more long-term weather averages for Toronto in September before you book your next holiday to Ontario in 2025/2026.

  • 21°C maximum daytime temperature in September in Toronto21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Toronto10
    10 days with some rainfall
  • 11°C minimum night-time temperature in September in Toronto11
    11°C min night temperature
  • 12 hours of daylight per day in September in Toronto12
    12 hours of daylight per day
  • No heat & humidity in September in Toronto0
    No heat & humidity
  • 75 mm monthly rainfall in September in Toronto75
    75 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Toronto5
    5 (Moderate) UV index
  • 19°C sea temperature in September in Toronto19
    19°C sea temperature

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The September weather guide for Ontario (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)

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More about Ontario

How hot is it in Toronto in September?

Daytime temperatures usually reach 21°C in Toronto in September, falling to 11°C at night.

How sunny is it in Toronto in September?

There are normally 6 hours of bright sunshine each day in Toronto in September - that's 48% of daylight hours.

How warm is the sea around Toronto in September?

The average sea temperature around Toronto in September is 19°C.

Does it rain in Toronto in September?

There are usually 10 days with some rain in Toronto in September and the average monthly rainfall is 75mm.

Toronto September sunrise & sunset times

Browse the sunrise and sunset times for Toronto in September 2025. Select a month to view Toronto sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:42 18:53
Monday, 15th September 2025 05:57 18:27
Tuesday, 30th September 2025 06:14 18:00

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