Ontario weather in May 2019

  • 18°C maximum daytime temperature in May in Ontario (Toronto)18
    18°C max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in May in Ontario (Toronto)11
    11 days with some rainfall
  • 8°C minimum night-time temperature in May in Ontario (Toronto)8
    8°C min night temperature
  • 15 hours of daylight per day in May in Ontario (Toronto)15
    15 hours of daylight per day
  • No heat & humidity in May in Ontario (Toronto)0
    No heat & humidity
  • 69 mm monthly rainfall in May in Ontario (Toronto)69
    69 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Ontario (Toronto)7
    7 (High) UV index
  • 7°C sea temperature in May in Ontario (Toronto)7
    7°C sea temperature

Going to Ontario? Find the best month to visit Ontario based on the weather.

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Expect 18°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Ontario in May. Check more long-term weather averages for Ontario in May before you book your next holiday to Ontario in 2019/2020. The May weather averages shown above are for Toronto.

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More about Ontario

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The May weather guide for Ontario, represented by 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.

Metric (°C / mm)  |  Imperial (°F / inches)

Guide to Ontario weather in May

The average maximum daytime temperature in Ontario in May is a comfortable 18°C (64°F). The average night-time temperature is usually a cool 8°C (46°F). There are usually 7 hours of bright sunshine each day, which represents 50% of the 15 hours of daylight.

Expect 69mm (2.7 inches) of rainfall across the whole of May with 11 days with some rain falling. Maximum UV levels will be high (7 UV index) at midday when the skies are clear.

The average sea temperature in and around Ontario in May is 7°C (45°F).

The weather in Ontario in May is represented by Toronto.

Ontario sunrise & sunset times for May 2019

Browse the sunrise & sunset times for Ontario in May 2019. Select a month to view Ontario sunrise & sunset times for the next twelve months. The Ontario sunrise & sunset times shown below are for Toronto.


Date Sunrise times Sunset times
Wednesday, 1st May 2019 06:10 20:20
Thursday, 2nd May 2019 06:09 20:21
Friday, 3rd May 2019 06:07 20:22
Saturday, 4th May 2019 06:06 20:23
Sunday, 5th May 2019 06:05 20:25
Monday, 6th May 2019 06:03 20:26
Tuesday, 7th May 2019 06:02 20:27
Wednesday, 8th May 2019 06:01 20:28
Thursday, 9th May 2019 06:00 20:29
Friday, 10th May 2019 05:58 20:30
Saturday, 11th May 2019 05:57 20:31
Sunday, 12th May 2019 05:56 20:33
Monday, 13th May 2019 05:55 20:34
Tuesday, 14th May 2019 05:54 20:35
Wednesday, 15th May 2019 05:53 20:36
Thursday, 16th May 2019 05:52 20:37
Friday, 17th May 2019 05:51 20:38
Saturday, 18th May 2019 05:50 20:39
Sunday, 19th May 2019 05:49 20:40
Monday, 20th May 2019 05:48 20:41
Tuesday, 21st May 2019 05:47 20:42
Wednesday, 22nd May 2019 05:46 20:43
Thursday, 23rd May 2019 05:45 20:44
Friday, 24th May 2019 05:44 20:45
Saturday, 25th May 2019 05:44 20:46
Sunday, 26th May 2019 05:43 20:47
Monday, 27th May 2019 05:42 20:48
Tuesday, 28th May 2019 05:41 20:49
Wednesday, 29th May 2019 05:41 20:50
Thursday, 30th May 2019 05:40 20:51
Friday, 31st May 2019 05:40 20:51
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Popular Ontario destinations

Below are average maximum temperatures at popular destinations in Ontario in May. Select a destination to see more weather parameters.

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