Ontario weather in October 2025

Expect 57°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Ontario in October. Check more long-term weather averages for Ontario in October before you book your next holiday to Ontario in 2025/2026.

  • 57°F maximum daytime temperature in October in Ontario (Toronto)57
    57°F max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in October in Ontario (Toronto)11
    11 days with some rainfall
  • 43°F minimum night-time temperature in October in Ontario (Toronto)43
    43°F min night temperature
  • 11 hours of daylight per day in October in Ontario (Toronto)11
    11 hours of daylight per day
  • No heat & humidity in October in Ontario (Toronto)0
    No heat & humidity
  • 2.5 inches monthly rainfall in October in Ontario (Toronto)2.5
    2.5 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in October in Ontario (Toronto)3
    3 (Moderate) UV index
  • 57°F sea temperature in October in Ontario (Toronto)57
    57°F sea temperature

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The October 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.

Top Ontario destinations

Below are average maximum temperatures at popular countries, regions and places in Ontario in October. Select a holiday destination to see more weather parameters.

All Ontario destinations

Metric (°C)  |  Imperial (°F)

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More about Canada

How warm is it in Ontario in October?

Daytime temperatures usually reach 57°F in Toronto, Ontario in October, falling to 43°F at night.

How sunny is it in Ontario in October?

There are normally 5 hours of bright sunshine each day in Toronto, Ontario in October - that's 42% of daylight hours.

How warm is the sea around Ontario in October?

The average sea temperature around Toronto, Ontario in October is 57°F.

Does it rain in Ontario in October?

There are usually 11 days with some rain in Toronto, Ontario in October and the average monthly rainfall is 2.5 inches.

Ontario October sunrise & sunset times

Browse the sunrise and sunset times for Ontario in October 2025. Select a month to view Ontario sunrise and sunset times for the next 12 months. The Ontario sunrise and sunset times shown below are for Toronto.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st October 2025 06:15 17:58
Thursday, 16th October 2025 06:33 17:32
Friday, 31st October 2025 06:53 17:09

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