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May Weather in Ancaster, Canada

Last updated: June 18, 2025

In May, the average temperature in Ancaster, Canada is a comfortable 14°C (57°F). However, be prepared for a range of temperatures, as the minimum can drop to -3°C (27°F), while the maximum may reach a warm 32°C (90°F). During this month, precipitation averages 96 mm (3.8 in) over approximately 12 days, contributing to an average humidity level of 82%.

May Temperature in Ancaster

In May in Ancaster, the average temperature is 14°C (57°F), with maximums reaching 32°C (90°F) and minimums dropping as low as -3°C (27°F). This variation means travelers should be prepared for both warm days and potentially chilly nights.

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

The chart illustrates May temperature patterns in Ancaster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ancaster, May typically has an average temperature of 14°C (57°F), with highs reaching up to 32°C (90°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec252634445767727064523831
Data source: Temperature data for Ancaster 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 Ancaster

In Ancaster in May, the precipitation amount is 96 mm (3.8 in) spread over a duration of 12 days.

May Precipitation Trends in Ancaster

The chart displays monthly precipitation patterns in Ancaster, 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 Ancaster, May typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec69736510396989389691017573
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Ancaster

In Ancaster in May, humidity is 82%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making outdoor activities uncomfortable and travel more challenging due to the heavy, damp air.

May Average Humidity in Ancaster

This chart illustrates the average monthly humidity levels in Ancaster, 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 Ancaster is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%88%87%83%81%79%80%81%84%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Ancaster

In Ancaster 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 Ancaster.

Maximum UV Index Levels in Ancaster for May

The chart shows the monthly maximum UV Index (UVI) for Ancaster 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 Ancaster typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Ancaster 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 Ancaster Compares to Other Months

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

This table compares monthly weather conditions in Ancaster, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)69 mm (2.7 inches)90%low
February Weather-3°C (26°F)73 mm (2.9 inches)90%moderate
March Weather1°C (34°F)64 mm (2.5 inches)87%moderate
April Weather7°C (44°F)103 mm (4.1 inches)87%very high
May Weather14°C (57°F)96 mm (3.8 inches)82%very high
June Weather19°C (67°F)98 mm (3.9 inches)81%very high
July Weather22°C (73°F)93 mm (3.6 inches)79%very high
August Weather21°C (71°F)89 mm (3.5 inches)80%very high
September Weather18°C (64°F)69 mm (2.7 inches)81%high
October Weather11°C (53°F)101 mm (4.0 inches)84%moderate
November Weather3°C (38°F)75 mm (2.9 inches)88%moderate
December Weather-1°C (31°F)73 mm (2.9 inches)87%low

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