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May Weather in Toronto, United States

Last updated: June 24, 2025

In May, the average temperature in Toronto, United States hovers around 17°C (62°F). However, temperatures can vary dramatically, with a minimum of -2°C (30°F) and a maximum reaching up to 31°C (89°F). Expect a fair share of rain, with 134 mm (5.3 in) of precipitation spread across about 15 days. Humidity is notably high, averaging 81%, contributing to the region's unique climate.

May Temperature in Toronto

In May in Toronto, the average temperature is 17°C (62°F), with maximums reaching 31°C (89°F) and minimums falling as low as -2°C (30°F). This varied climate makes Toronto a perfect destination for travelers seeking diverse weather experiences.

May Weather in Toronto: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Toronto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Toronto, May typically has an average temperature of 17°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around -2°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec313441516270757368574236
Data source: Temperature data for Toronto generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Toronto

In Toronto in May, the total precipitation amount is 134 mm (5.3 in) spread over a period of 15 days.

May Precipitation Trends in Toronto

The chart displays monthly precipitation patterns in Toronto, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Toronto, May typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec90115103131134131134891201209299
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Toronto

In Toronto in May, humidity is 81%. With an average temperature of 17°C (62°F), this humidity feels like a warm blanket enveloping you, making outdoor adventures feel sticky and requiring frequent breaks to stay comfortable while exploring.

May Average Humidity in Toronto

This chart illustrates the average monthly humidity levels in Toronto, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Toronto is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Toronto

In Toronto in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Toronto.

Maximum UV Index Levels in Toronto for May

The chart shows the monthly maximum UV Index (UVI) for Toronto in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Toronto typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Toronto May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Toronto Compares to Other Months

Weather in Toronto varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Toronto, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Toronto, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)90 mm (3.6 inches)88%moderate
February Weather1°C (35°F)115 mm (4.5 inches)88%moderate
March Weather5°C (41°F)103 mm (4.0 inches)87%high
April Weather11°C (51°F)130 mm (5.1 inches)87%very high
May Weather17°C (62°F)134 mm (5.3 inches)81%very high
June Weather21°C (70°F)131 mm (5.2 inches)83%very high
July Weather24°C (75°F)134 mm (5.3 inches)82%very high
August Weather23°C (73°F)89 mm (3.5 inches)76%very high
September Weather20°C (68°F)120 mm (4.7 inches)77%very high
October Weather14°C (57°F)120 mm (4.7 inches)82%high
November Weather5°C (42°F)92 mm (3.6 inches)89%moderate
December Weather2°C (36°F)99 mm (3.9 inches)86%low

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