Ottawa weather in August 2021

Get the latest coronavirus (COVID-19) updates for Canada with current travel advice, vaccine statistics and online resources.

  • 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

Recommended for Ontario

  • Top deals & discounts
  • Ottawa weather overview
  • Ottawa climate averages by month
  • More destinations
  • Best time to go to Ottawa
  • Ottawa 5-day weather forecast

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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.

Air Canada: Low fares to the Americas

  • Save on flights to Canada, USA & the rest of the Americas
  • Book online for low fares with Air Canada
  • Fly to Toronto, Vancouver, New York, Cancun & more
Go to Air Canada deal >>

View all Air Canada offers

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)

Back to top

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

Canada Affair sale: Top deals on Canada holidays

  • Save on holidays to Canada with Canada Affair
  • Book early on summer & winter holidays in 2021/2022
  • Choose from rail breaks, fly drive, cruises & more
Go to Canada Affair deal >>

View all Canada Affair offers

Related posts

Popular travel offers

Top ^

*affiliate links: find out how we are funded and why this helps us remain free to use.