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 45°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.

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 2.9 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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