Ottawa weather in September 2021

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

  • 20°C maximum daytime temperature in September in Ottawa20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 12 days with some rainfall in September in Ottawa12
    12 days with some rainfall
  • 9°C minimum night-time temperature in September in Ottawa9
    9°C min night temperature
  • 12 hours of daylight per day in September in Ottawa12
    12 hours of daylight per day
  • No heat & humidity in September in Ottawa0
    No heat & humidity
  • 80 mm monthly rainfall in September in Ottawa80
    80 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Ottawa5
    5 (Moderate) 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 September 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.

  • Save on holidays in 2021/2022 with latest deals & discounts
  • Offers include free upgrades & extras + low deposits
  • Browse the best deals or search by destination & date

How hot is it in Ottawa in September?

Daytime temperatures usually reach 20°C in Ottawa in September, falling to 9°C at night.

How sunny is it in Ottawa in September?

There are normally 6 hours of bright sunshine each day in Ottawa in September - that's 46% of daylight hours.

Does it rain in Ottawa in September?

There are usually 12 days with some rain in Ottawa in September and the average monthly rainfall is 80mm.

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

Back to top

Ottawa sunrise & sunset times for September 2021

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st September 2021 06:25 19:40
Wednesday, 15th September 2021 06:42 19:13
Thursday, 30th September 2021 07:00 18:44
  • Become a Green Motion loyalty member for FREE
  • Save up to 25% on future car rentals + extra offers
  • Discount varies by membership tier & number of rentals

Related posts

Popular travel offers

Top ^

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