April Weather in Sion, Canada

Last updated: June 18, 2025

In April, the average temperature in Sion, Canada hovers around 5°C (42°F). Expect a chilly minimum of -6°C (21°F) and a pleasant maximum of 23°C (74°F). With an average humidity of 85%, you'll feel the dampness in the air. Don't forget your umbrella, as you'll encounter about 69 mm (2.7 in) of precipitation spread over 13 days!

April Temperature in Sion

In April in Sion, the average temperature is 5°C (42°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures, making layering essential for outdoor activities.

April Weather in Sion: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Sion, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sion, April typically has an average temperature of 5°C (42°F), with highs reaching up to 23°C (74°F) and lows dropping to around -6°C (21°F).

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

April Precipitation in Sion

In Sion in April, the precipitation amount is 69 mm (2.7 in) over the course of 13 days.

April Precipitation Trends in Sion

The chart displays monthly precipitation patterns in Sion, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Sion, April typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

April Humidity in Sion

In Sion in April, humidity is 85%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.

April Average Humidity in Sion

This chart illustrates the average monthly humidity levels in Sion, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Sion is approximately 85%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Sion

In Sion in April, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Sion.

Maximum UV Index Levels in Sion for April

The chart shows the monthly maximum UV Index (UVI) for Sion in April, 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 April, the maximum UV index in Sion typically reaches 7, which falls under the high exposure category.

Data source: Sion April 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 April Weather in Sion Compares to Other Months

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

This table compares monthly weather conditions in Sion, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	74 mm (2.9 inches)	90%	low
February Weather	-5°C (24°F)	59 mm (2.3 inches)	91%	moderate
March Weather	1°C (34°F)	68 mm (2.7 inches)	89%	moderate
April Weather	5°C (42°F)	69 mm (2.7 inches)	85%	high
May Weather	12°C (53°F)	66 mm (2.6 inches)	82%	very high
June Weather	16°C (61°F)	45 mm (1.8 inches)	81%	very high
July Weather	20°C (69°F)	13 mm (0.5 inches)	84%	very high
August Weather	20°C (68°F)	18 mm (0.7 inches)	75%	very high
September Weather	13°C (57°F)	45 mm (1.8 inches)	74%	high
October Weather	5°C (42°F)	59 mm (2.3 inches)	85%	moderate
November Weather	0°C (33°F)	71 mm (2.8 inches)	88%	low
December Weather	-4°C (26°F)	72 mm (2.8 inches)	93%	low