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May Weather in Welland, Canada

Last updated: June 18, 2025

In May, the average temperature in Welland, Canada hovers around 12°C (54°F). Expect fluctuations, with minimums dipping to 0°C (33°F) and maximums reaching a pleasant 25°C (78°F). Be prepared for 104 mm (4.1 in) of precipitation over 13 days, accompanied by an average humidity of 82%.

May Temperature in Welland

In May in Welland, the average temperature is 12°C (54°F), with maximums reaching up to 25°C (78°F) and minimums dipping as low as 0°C (33°F). This mild weather makes Welland an ideal destination for outdoor activities and exploring the local sights during this time of year.

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

The chart illustrates May temperature patterns in Welland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Welland, May typically has an average temperature of 12°C (54°F), with highs reaching up to 25°C (78°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934425465727266564235
Data source: Temperature data for Welland 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 Welland

In Welland in May, the precipitation amount is 104 mm (4.1 in) over the course of 13 days.

May Precipitation Trends in Welland

The chart displays monthly precipitation patterns in Welland, 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 Welland, May typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec7985771181048412485801339293
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Welland

In Welland in May humidity is 82%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and sweat-inducing, which can be quite uncomfortable for traveling.

May Average Humidity in Welland

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

In Welland 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 Welland.

Maximum UV Index Levels in Welland for May

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

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

This table compares monthly weather conditions in Welland, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)79 mm (3.1 inches)91%low
February Weather-2°C (29°F)85 mm (3.4 inches)91%moderate
March Weather1°C (34°F)77 mm (3.0 inches)88%moderate
April Weather6°C (43°F)118 mm (4.6 inches)88%very high
May Weather12°C (54°F)104 mm (4.1 inches)82%very high
June Weather18°C (65°F)84 mm (3.3 inches)79%very high
July Weather22°C (73°F)124 mm (4.9 inches)77%very high
August Weather22°C (72°F)85 mm (3.4 inches)72%very high
September Weather19°C (66°F)80 mm (3.2 inches)76%high
October Weather13°C (56°F)133 mm (5.2 inches)83%moderate
November Weather6°C (42°F)92 mm (3.6 inches)88%moderate
December Weather1°C (35°F)93 mm (3.7 inches)87%low

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