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May Weather in Ajax, Canada

Last updated: June 18, 2025

In May, the average temperature in Ajax, Canada hovers around 9°C (49°F), with extremes ranging from a chilly 0°C (33°F) to a comfortable 20°C (68°F). Expect some rain, as 105 mm (4.1 in) of precipitation usually falls over 12 days. With an average humidity of 82%, it's a month that feels quite damp—perfect for cozy indoor activities!

May Temperature in Ajax

In May in Ajax, the average temperature is 9°C (49°F), with maximums reaching up to 20°C (68°F) and minimums dropping as low as 0°C (33°F). It's a great time to pack layers to enjoy the mild weather and prepare for cooler evenings while exploring the region.

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

The chart illustrates May temperature patterns in Ajax, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ajax, May typically has an average temperature of 9°C (49°F), with highs reaching up to 20°C (68°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec272833404860707165554133
Data source: Temperature data for Ajax 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 Ajax

In Ajax in May, the precipitation amount is 105 mm (4.1 in) over the course of 12 days.

May Precipitation Trends in Ajax

The chart displays monthly precipitation patterns in Ajax, 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 Ajax, May typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec8488771221057770787311810296
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Ajax

In Ajax in May, humidity is 82%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities less enjoyable and prompting travelers to seek warmth indoors or in cozy cafes.

May Average Humidity in Ajax

This chart illustrates the average monthly humidity levels in Ajax, 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 Ajax 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 Ajax

In Ajax 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 Ajax.

Maximum UV Index Levels in Ajax for May

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

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

This table compares monthly weather conditions in Ajax, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)84 mm (3.3 inches)91%low
February Weather-2°C (28°F)88 mm (3.5 inches)91%moderate
March Weather1°C (33°F)77 mm (3.0 inches)88%moderate
April Weather5°C (41°F)122 mm (4.8 inches)88%very high
May Weather9°C (49°F)105 mm (4.1 inches)82%very high
June Weather16°C (60°F)77 mm (3.0 inches)79%very high
July Weather21°C (70°F)70 mm (2.7 inches)77%very high
August Weather22°C (71°F)78 mm (3.1 inches)72%very high
September Weather18°C (65°F)73 mm (2.9 inches)76%high
October Weather13°C (55°F)118 mm (4.6 inches)83%moderate
November Weather5°C (41°F)102 mm (4.0 inches)88%moderate
December Weather1°C (33°F)96 mm (3.8 inches)87%low

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