Ottawa weather in May 2021

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  • 18°C maximum daytime temperature in May in Ottawa18
    18°C max day temperature
  • 7 hours of sunshine per day
  • 12 days with some rainfall in May in Ottawa12
    12 days with some rainfall
  • 7°C minimum night-time temperature in May in Ottawa7
    7°C min night temperature
  • 15 hours of daylight per day in May in Ottawa15
    15 hours of daylight per day
  • No heat & humidity in May in Ottawa0
    No heat & humidity
  • 73 mm monthly rainfall in May in Ottawa73
    73 mm of monthly rainfall
  • UV (maximum) index 6 (High) in May in Ottawa6
    6 (High) UV index

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The May 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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How hot is it in Ottawa in May?

Daytime temperatures usually reach 18°C in Ottawa in May, falling to 7°C at night.

How sunny is it in Ottawa in May?

There are normally 7 hours of bright sunshine each day in Ottawa in May - that's 50% of daylight hours.

Does it rain in Ottawa in May?

There are usually 12 days with some rain in Ottawa in May and the average monthly rainfall is 73mm.

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

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Ottawa sunrise & sunset times for May 2021

Browse the sunrise & sunset times for Ottawa in May 2021. Select a month to view Ottawa sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Saturday, 1st May 2021 05:51 20:10
Sunday, 16th May 2021 05:31 20:28
Monday, 31st May 2021 05:18 20:43
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Where is hot in Ontario in May for 2021/2022?

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

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