Sion Climate by Month
Sion experiences great temperature shifts.
The city's weather can transition from pleasant days
to very cold weather.
It is also known for its large amounts of rain/snowfall.
Now, let’s explore all the climate details to give you a full picture.
Average day and night temperature
The climate in Sion is known for significant temperature differences throughout the year, making the weather dynamic. Typically, daytime temperatures range from a pleasant 19°C in July to a very cold -3°C in the coolest month, January. Nights are cooler, with temperatures generally dropping to -13°C, particularly during the colder months.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Sion has a notably wet climate with abundant precipitation, recording 1636 mm of rain/snowfall per year. Precipitation levels in Sion remain relatively steady throughout the year. June has the most rain, with 167 mm over 18 days. In October, this drops slightly to 113 mm, making the city's climate fairly predictable.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
For those who appreciate different seasons, Sion serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 9.0 hours of sunshine daily, and embrace the darker days in December, offering only 2.3 hours of daily sunlight.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is low throughout the year in Sion.
Relative humidity over the year
Average wind speed
The mean wind speed over the year in Sion ranges from 1°C in January to 2°C in February.
The mean monthly wind speed over the year (meters per second)
The best time of year to visit Sion in Switzerland
Other facts from our historical weather data:Most rainfall (rainy season) is seen in May, June, July and August.
The coldest season / winter is in the following months: January, February, November and December.
July has an average maximum temperature of 19°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of -3°C.
June tops the wettest month list with 167 mm of rainfall.
October is the driest month with 113 mm of precipitation.
July is the sunniest month with an average of 270 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
