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Ottawa weather in May 2025
Expect 18°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Ottawa in May. Check more long-term weather averages for Ottawa in May before you book your next holiday to Ontario in 2025/2026.
- 1818°C max day temperature
- 7 hours of sunshine per day
- 1212 days with some rainfall
- 77°C min night temperature
- 1515 hours of daylight per day
- 0No heat & humidity
- 7373 mm of monthly rainfall
- 66 (High) UV index
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Ottawa by month
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Recommended for Ontario
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)
More about Canada
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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