Ontario weather in August 2025

Expect 25°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Ontario in August. Check more long-term weather averages for Ontario in August before you book your next holiday to Ontario in 2025/2026.

  • 25°C maximum daytime temperature in August in Ontario (Toronto)25
    25°C max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in August in Ontario (Toronto)10
    10 days with some rainfall
  • 15°C minimum night-time temperature in August in Ontario (Toronto)15
    15°C min night temperature
  • 14 hours of daylight per day in August in Ontario (Toronto)14
    14 hours of daylight per day
  • Low heat & humidity in August in Ontario (Toronto)L
    Low heat & humidity
  • 83 mm monthly rainfall in August in Ontario (Toronto)83
    83 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Ontario (Toronto)7
    7 (High) UV index
  • 21°C sea temperature in August in Ontario (Toronto)21
    21°C sea temperature

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The August 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 August. Select a holiday destination to see more weather parameters.

All Ontario destinations

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

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More about Canada

How hot is it in Ontario in August?

Daytime temperatures usually reach 25°C in Toronto, Ontario in August with low heat and humidity, falling to 15°C at night.

How sunny is it in Ontario in August?

There are normally 8 hours of bright sunshine each day in Toronto, Ontario in August - that's 56% of daylight hours.

How warm is the sea around Ontario in August?

The average sea temperature around Toronto, Ontario in August is 21°C.

Does it rain in Ontario in August?

There are usually 10 days with some rain in Toronto, Ontario in August and the average monthly rainfall is 83mm.

Ontario August sunrise & sunset times

Browse the sunrise and sunset times for Ontario in August 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
Friday, 1st August 2025 05:07 19:40
Saturday, 16th August 2025 05:24 19:19
Sunday, 31st August 2025 05:40 18:54

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