Weather in May in Ontario
Planning a trip to Ontario this May? Here's what you need to know about the weather:
What is the weather like in Ontario in May?
Ontario is a region in Canada. Ontario offers a broad spectrum of weather patterns. In May, one might encounter temperatures that range from cold to pleasant, and precipitation levels ranging from moderate to high.
Temperatures
The average maximum daytime temperatures vary from cold in Schreiber at 9°C to pleasant in Kemptville at 21°C. Nighttime temperatures generally drop to 8°C in Kemptville and 3°C in Schreiber.For specific regional insights in Ontario, refer to the map provided below.
Precipitation
In May, precipitation varies across different areas. From moderate rainfall in Niagara on the Lake with an average of 47 mm to high rainfall in London with 102 mm.Average sunshine
The days are mostly sunny, with an average total of around 227 hours of sunshine in Toronto. The sunlight during this month doesn't just make the days brighter, it also seems to make everyone a bit more cheerful.For an in-depth overview of the yearly conditions, do visit our Ontario climate page.
Where to go in Ontario in May
perfect weather
pleasant
tolerable
unpleasant
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Select a Month of Interest
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Ontario's climate page.
Popular destinations
What is the weather like in May for the 5 most popular destinations in Ontario?
Toronto
In May Toronto generally has moderate temperatures with maximum daytime temperatures around 16°C, minimum nighttime temperatures around 8°C and moderate monthly rainfall. So on average the conditions are tolerable that month.
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Ottawa
In May Ottawa generally has pleasant temperatures with maximum daytime temperatures around 20°C, minimum nighttime temperatures around 7°C and moderate monthly rainfall. So on average the conditions are perfect that month.
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Niagara Falls
In May Niagara Falls generally has pleasant temperatures with maximum daytime temperatures around 21°C, minimum nighttime temperatures around 9°C and moderate monthly rainfall. So on average the conditions are perfect that month.
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Mississauga
In May Mississauga generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 8°C and moderate monthly rainfall. So on average the conditions are pleasant that month.
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Niagara on the Lake
In May Niagara on the Lake generally has moderate temperatures with maximum daytime temperatures around 15°C, minimum nighttime temperatures around 6°C and moderate monthly rainfall. So on average the conditions are tolerable that month.
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Is your destination not in the list? Have a look at other destinations in Ontario, in Canada.
Is May the best time to visit Ontario?
In our opinion, May is a good time to visit Ontario with overall tolerable weather in Toronto. However, the weather conditions may vary depending on your destination.
Generally speaking, the best visiting conditions can be found in June, July, August and September offering mostly perfect weather in Toronto. In contrast, January, February, March, April, November and December tend to have poor weather conditions.
Interested in more climate information?
We have much more information about the climate in Ontario.
Weather and climate has detailed information for every country in the world. Are you going to Canada? Get detailed historical weather averages for many cities in Canada.
Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.