Ottawa weather in August 2019

  • 25°C maximum daytime temperature in August in Ottawa25
    25°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in August in Ottawa11
    11 days with some rainfall
  • 14°C minimum night-time temperature in August in Ottawa14
    14°C min night temperature
  • 14 hours of daylight per day in August in Ottawa14
    14 hours of daylight per day
  • No heat & humidity in August in Ottawa0
    No heat & humidity
  • 86 mm monthly rainfall in August in Ottawa86
    86 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Ottawa7
    7 (High) UV index
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The August weather guide for Ottawa, Ontario 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.

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

Guide to Ottawa weather in August

The average maximum daytime temperature in Ottawa in August is a warm 25°C (77°F). The average night-time temperature is usually a comfortable 14°C (57°F). There are usually 8 hours of bright sunshine each day, which represents 55% of the 14 hours of daylight.

Expect 86mm (3.4 inches) of rainfall across the whole of August with 11 days with some rain falling. Maximum UV levels will be high (7 UV index) at midday when the skies are clear.

Ottawa sunrise & sunset times for August 2019

Browse the sunrise & sunset times for Ottawa in August 2019. Select a month to view Ottawa sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Thursday, 1st August 2019 05:47 20:31
Friday, 16th August 2019 06:04 20:09
Saturday, 31st August 2019 06:23 19:43
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Where's hot in Ontario in August?

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

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