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May Weather in Casselman, Canada

Last updated: June 18, 2025

In Casselman, Canada, the average temperature in May hovers around 14°C (57°F). While the mercury can dip as low as -3°C (27°F), it can also soar to a sizzling 35°C (96°F). Expect about 113 mm (4.4 in) of precipitation over 12 days, with an average humidity level of 75%. Get ready for a month of varied weather!

May Temperature in Casselman

In May in Casselman, the average temperature is 14°C (57°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop as low as -3°C (27°F). It's a great time to pack for a variety of weather conditions while exploring Casselman.

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

The chart illustrates May temperature patterns in Casselman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casselman, May typically has an average temperature of 14°C (57°F), with highs reaching up to 35°C (96°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec182029435766716961503424
Data source: Temperature data for Casselman 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 Casselman

In Casselman in May, the precipitation amount is 113 mm (4.4 in) spread over 12 days.

May Precipitation Trends in Casselman

The chart displays monthly precipitation patterns in Casselman, 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 Casselman, May typically receives around 113 mm (4.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec818390118113101118977513410184
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Casselman

In Casselman in May, humidity is 75%. With an average temperature of 14°C (57°F), this humidity feels like a damp blanket enveloping you, making outdoor activities somewhat uncomfortable and travel a bit sluggish, as the air feels heavy and the heat lingers close to your skin.

May Average Humidity in Casselman

This chart illustrates the average monthly humidity levels in Casselman, 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 Casselman is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%86%82%75%68%69%67%72%83%88%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Casselman

In Casselman 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 Casselman.

Maximum UV Index Levels in Casselman for May

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

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

This table compares monthly weather conditions in Casselman, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)81 mm (3.2 inches)93%low
February Weather-7°C (20°F)83 mm (3.3 inches)93%moderate
March Weather-2°C (29°F)90 mm (3.5 inches)86%moderate
April Weather6°C (43°F)118 mm (4.6 inches)82%very high
May Weather14°C (57°F)113 mm (4.4 inches)75%very high
June Weather19°C (66°F)101 mm (4.0 inches)68%very high
July Weather22°C (72°F)118 mm (4.6 inches)69%very high
August Weather21°C (69°F)97 mm (3.8 inches)67%very high
September Weather16°C (61°F)75 mm (2.9 inches)72%high
October Weather10°C (50°F)134 mm (5.3 inches)83%moderate
November Weather1°C (34°F)101 mm (4.0 inches)88%moderate
December Weather-5°C (24°F)84 mm (3.3 inches)89%low

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