Ottawa weather in May 2026

Expect daytime maximum temperatures of 64°F in Ottawa, Ontario in May based on long-term weather averages. There are 7 hours of sunshine per day on average with 12 days with some rainfall and typically 2.9 inches of rainfall in the month.

  • 64°F maximum daytime temperature in May in Ottawa64
    64°F max day temperature
  • 7 hours of sunshine per day
  • 12 days with some rainfall in May in Ottawa12
    12 days with some rainfall
  • 45°F minimum night-time temperature in May in Ottawa45
    45°F 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
  • 2.9 inches monthly rainfall in May in Ottawa2.9
    2.9 inches 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 Ontario (Ottawa) 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.

Metric (°C)  |  Imperial (°F)

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More about Ontario

How hot is it in Ottawa in May?

Daytime temperatures usually reach 64°F in Ottawa in May, falling to 46°F 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.

How warm is the sea around Ottawa in May?

The average sea temperature around Ottawa in May is 45°F.

Does it rain in Ottawa in May?

There are usually 11 days with some rain in Ottawa in May and the average monthly rainfall is 2.7 inches.

Ottawa May sunrise & sunset times

Browse the sunrise and sunset times for Ottawa in May 2026. Select a month to view Ottawa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 04:51 19:10
Saturday, 16th May 2026 04:31 19:28
Sunday, 31st May 2026 04:18 19:43

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