Ottawa weather in August 2021

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  • 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.

How hot is it in Ottawa in August?

Daytime temperatures usually reach 25°C in Ottawa in August with no heat and humidity, falling to 14°C at night.

How sunny is it in Ottawa in August?

There are normally 8 hours of bright sunshine each day in Ottawa in August - that's 55% of daylight hours.

Does it rain in Ottawa in August?

There are usually 11 days with some rain in Ottawa in August and the average monthly rainfall is 86mm.

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

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Ottawa sunrise & sunset times for August 2021

Browse the sunrise and sunset times for Ottawa in August 2021. Select a month to view Ottawa sunrise & sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st August 2021 05:47 20:30
Monday, 16th August 2021 06:05 20:08
Tuesday, 31st August 2021 06:23 19:42

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