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May Weather in Markham, Canada

Last updated: June 18, 2025

In Markham, Canada, the average temperature for May hovers around 10°C (50°F). Expect a minimum of 0°C (32°F) and a pleasant maximum of 22°C (73°F). With an average precipitation of 103 mm (4.1 in) spread across 12 days, it's a month where you'll want to be prepared for some rain. Stay comfortable in the 82% humidity as you explore this vibrant location!

May Temperature in Markham

In May in Markham, the average temperature is 10°C (50°F), with maximums reaching up to 22°C (73°F) and minimums dropping as low as 0°C (32°F). Be sure to pack layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates May temperature patterns in Markham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Markham, May typically has an average temperature of 10°C (50°F), with highs reaching up to 22°C (73°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec272733415061707065544032
Data source: Temperature data for Markham 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 Markham

In Markham in May, the total precipitation amount is 103 mm (4.1 in), occurring over the course of 12 days.

May Precipitation Trends in Markham

The chart displays monthly precipitation patterns in Markham, 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 Markham, May typically receives around 103 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec808375118103807376691159691
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Markham

In Markham in May, humidity is 82%. With an average temperature of 10°C (50°F), this humidity feels like a dense, heavy blanket wrapping around you, making every step feel sluggish and the air thick, which can make traveling quite uncomfortable.

May Average Humidity in Markham

This chart illustrates the average monthly humidity levels in Markham, 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 Markham is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Markham

In Markham in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Markham.

Maximum UV Index Levels in Markham for May

The chart shows the monthly maximum UV Index (UVI) for Markham 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 Markham typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899987532
Data source: Markham 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 Markham Compares to Other Months

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

This table compares monthly weather conditions in Markham, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)80 mm (3.2 inches)91%low
February Weather-3°C (28°F)83 mm (3.3 inches)91%moderate
March Weather0°C (33°F)75 mm (2.9 inches)88%moderate
April Weather5°C (41°F)118 mm (4.6 inches)88%very high
May Weather10°C (50°F)103 mm (4.1 inches)82%very high
June Weather16°C (62°F)80 mm (3.1 inches)79%very high
July Weather21°C (71°F)73 mm (2.9 inches)77%very high
August Weather21°C (71°F)76 mm (3.0 inches)72%very high
September Weather18°C (65°F)69 mm (2.7 inches)76%high
October Weather12°C (54°F)115 mm (4.5 inches)83%moderate
November Weather4°C (40°F)96 mm (3.8 inches)88%moderate
December Weather0°C (33°F)91 mm (3.6 inches)87%low

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