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Ontario weather in May 2025
Expect daytime maximum temperatures of 18°C in Ontario, Canada in May based on long-term weather averages. There are 7 hours of sunshine per day on average with 11 days with some rainfall and typically 69 mm of rainfall in the month.
- 18°C max day temperature
18 - 7 hours of sunshine per day
- 11 days with some rainfall
11 - 8°C min night temperature
8 - 15 hours of daylight per day
15 - No heat & humidity
0 - 69 mm of monthly rainfall
69 - 7 (High) UV index
7 - 7°C sea temperature
7
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Recommended for Ontario
The May weather guide for Ontario (Toronto) 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.
Top Ontario destinations
Below are average maximum temperatures at popular countries, regions and places in Ontario in May. Select a holiday destination to see more weather parameters.
All Ontario destinations
- Hamilton
- Kenora
- Kingston
- Moosonee
- Niagara Falls
- North Bay
- Ottawa
- Peawanuk
- Sault Ste. Marie
- Sudbury
- Thunder Bay
- Timmins
- Toronto
- Windsor
Metric (°C / mm) | Imperial (°F / inches)
More about Ontario
How hot is it in Ontario in May?
Daytime temperatures usually reach 18°C in Toronto, Ontario in May, falling to 8°C at night.
How sunny is it in Ontario in May?
There are normally 7 hours of bright sunshine each day in Toronto, Ontario in May - that's 50% of daylight hours.
Is the sea cold around Ontario in May?
The average sea temperature around Toronto, Ontario in May is 7°C.
Does it rain in Ontario in May?
There are usually 11 days with some rain in Toronto, Ontario in May and the average monthly rainfall is 69mm.
Ontario May sunrise & sunset times
Browse the sunrise and sunset times for Ontario in May 2025. Select a month to view Ontario sunrise and sunset times for the next 12 months. The Ontario sunrise and sunset times shown below are for Toronto.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Thursday, 1st May 2025 | 05:09 | 19:21 |
| Friday, 16th May 2025 | 04:51 | 19:38 |
| Saturday, 31st May 2025 | 04:39 | 19:52 |
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