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CanadaThe weather in May in Ontario
It's pleasantly warm in May in Ontario with an average temperature of 19°C. Temperatures this month range from a low of 14°C to a high of 26°C. At night, you can expect temperatures between 7°C and 16°C.
Looking for great weather? May is a good time to be in Ontario. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in May for Ontario, Canada. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 32°C in 2022, Ontario reached the highest temperature in May over the past 10 years. The lowest daytime temperature in this month was 5°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of -2°C to a highest value of 21°C.
Rainfall amount
In May, there is an average of 57 mm of precipitation, spread over 9 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in May for Ontario
Click on any day in May to get detailed info about the usual weather on that day in Ontario. Check out the historical temperatures and precipitation over the past 10 years on this day.
May weather comparison
| Ontario | New York | |
|---|---|---|
| Average temperature | 19°C | 22°C |
| Max. temperature | 26°C | 28°C |
| Min. temperature | 7°C | -5°C |
| Total precipitation | 57 mm | 105 mm |
| Rainy days | 9 days | 14 days |
Start of May
The month of May starts in Ontario with cool temps, averaging around 16°C during the day and nights around 9°C.
Mid May
By mid-May, daytime temps rise to around 20°C, with nights around 11°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of May
By the end of May, the average daytime temperature in Ontario is around 24°C, while nighttime temps are about 14°C. A shower might pop up, but overall, the weather will be dry and sunny.
Find affordable vacations to Ontario
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Ontario for all months and discover the best travel time
Curious about the weather in other parts of Canada? Check out the climate and weather for spots like Vancouver, Toronto, Niagara Falls, or explore other destinations in Canada.
Temperature charts
These charts show the average temperatures in May in Ontario, Canada. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in May in Ontario
Temperature in May in Ontario over the years
Precipitation charts
These charts show the average amount of precipitation in May in Ontario, Canada. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in May in Ontario
Total precipitation in May in Ontario over the years
Daily UV index in May in Ontario
This chart shows the average daily UV index in May in Ontario, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in May in Ontario
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Average weather in Ontario by month
Click on a month below to see detailed weather info for Ontario. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.