Ottawa weather in May 2025

Expect daytime maximum temperatures of 18°C in Ottawa 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 73 mm of rainfall in the month.

  • 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 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 / mm)  |  Imperial (°F / inches)

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More about Ontario

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.

Ottawa May sunrise & sunset times

Browse the sunrise and sunset times for Ottawa in May 2025. Select a month to view Ottawa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:51 19:10
Friday, 16th May 2025 04:31 19:28
Saturday, 31st May 2025 04:18 19:43

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