May Weather in Altona, Canada

Last updated: June 18, 2025

In May, the average temperature in Altona, Canada hovers around 13°C (55°F), offering a mild climate for visitors. However, be prepared for variability, as temperatures can dip to a chilly -6°C (21°F) or climb to a warm 32°C (90°F). You'll likely encounter approximately 46 mm (1.8 in) of precipitation over 8 days, with an average humidity of 74% to keep the air feeling fresh.

May Temperature in Altona

In May in Altona, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (90°F), while minimum temperatures can drop as low as -6°C (21°F). It's advisable to pack both light and warm clothing to accommodate the wide temperature range for your travels.

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

The chart illustrates May temperature patterns in Altona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altona, May typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (90°F) and lows dropping to around -6°C (21°F).

Data source: Temperature data for Altona generated using information from the Copernicus Climate Change Service.

May Precipitation in Altona

In Altona in May, the precipitation amount is 46 mm (1.8 in) over the course of 8 days.

May Precipitation Trends in Altona

The chart displays monthly precipitation patterns in Altona, 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 Altona, May typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Altona

In Altona in May, humidity is 74%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities somewhat uncomfortable and demanding frequent breaks in shaded areas.

May Average Humidity in Altona

This chart illustrates the average monthly humidity levels in Altona, 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 Altona is approximately 74%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Altona

In Altona in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Altona.

Maximum UV Index Levels in Altona for May

The chart shows the monthly maximum UV Index (UVI) for Altona 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 Altona typically reaches 8, which falls under the very high exposure category.

Data source: Altona 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 Altona Compares to Other Months

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

This table compares monthly weather conditions in Altona, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-13°C (9°F)	16 mm (0.6 inches)	92%	low
February Weather	-15°C (6°F)	17 mm (0.7 inches)	90%	moderate
March Weather	-5°C (24°F)	19 mm (0.7 inches)	88%	moderate
April Weather	3°C (37°F)	25 mm (1.0 inches)	81%	high
May Weather	13°C (55°F)	46 mm (1.8 inches)	74%	very high
June Weather	20°C (67°F)	73 mm (2.9 inches)	72%	very high
July Weather	22°C (71°F)	59 mm (2.3 inches)	74%	very high
August Weather	20°C (68°F)	58 mm (2.3 inches)	76%	very high
September Weather	14°C (58°F)	78 mm (3.1 inches)	73%	high
October Weather	6°C (43°F)	72 mm (2.8 inches)	76%	moderate
November Weather	-4°C (25°F)	27 mm (1.1 inches)	86%	low
December Weather	-9°C (16°F)	27 mm (1.1 inches)	91%	low