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May Weather in Napierville, Canada

Last updated: June 18, 2025

In Napierville, Canada, the average temperature in May hovers around 14°C (57°F), offering a mild climate. However, be prepared for temperature swings, with minima dipping to 0°C (31°F) and maxima reaching 37°C (99°F). Expect a precipitation amount of 98 mm (3.8 in) spread over 11 days, contributing to an average humidity of 80%. Don't forget your umbrella!

May Temperature in Napierville

In May in Napierville, the average temperature is 14°C (57°F). Maximum temperatures can reach 37°C (99°F), while minimum temperatures can drop as low as 0°C (31°F). Visitors should be prepared for fluctuating temperatures, making versatile clothing essential for their travels.

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

The chart illustrates May temperature patterns in Napierville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Napierville, May typically has an average temperature of 14°C (57°F), with highs reaching up to 37°C (99°F) and lows dropping to around 0°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec182130435766727062503525
Data source: Temperature data for Napierville 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 Napierville

In Napierville in May, the precipitation amount is 98 mm (3.8 in) over the course of 11 days.

May Precipitation Trends in Napierville

The chart displays monthly precipitation patterns in Napierville, 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 Napierville, May typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec818082116981121161157314111482
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Napierville

In Napierville in May, humidity is 80%. With an average temperature of 14°C (57°F), this humidity feels like a warm, damp blanket wrapping around you, making travel uncomfortable and sticky, as sweat clings to your skin and the air feels heavy with moisture.

May Average Humidity in Napierville

This chart illustrates the average monthly humidity levels in Napierville, 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 Napierville is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Napierville

In Napierville 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 Napierville.

Maximum UV Index Levels in Napierville for May

The chart shows the monthly maximum UV Index (UVI) for Napierville 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 Napierville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799887532
Data source: Napierville 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 Napierville Compares to Other Months

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

This table compares monthly weather conditions in Napierville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (19°F)81 mm (3.2 inches)93%low
February Weather-6°C (21°F)80 mm (3.1 inches)92%moderate
March Weather-1°C (30°F)82 mm (3.2 inches)86%moderate
April Weather6°C (43°F)116 mm (4.6 inches)85%high
May Weather14°C (57°F)98 mm (3.8 inches)80%very high
June Weather19°C (67°F)112 mm (4.4 inches)74%very high
July Weather22°C (72°F)116 mm (4.6 inches)76%very high
August Weather21°C (70°F)115 mm (4.5 inches)75%very high
September Weather16°C (62°F)73 mm (2.9 inches)78%high
October Weather10°C (51°F)141 mm (5.6 inches)86%moderate
November Weather2°C (35°F)114 mm (4.5 inches)88%moderate
December Weather-4°C (25°F)82 mm (3.2 inches)89%low

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