Sion weather in May (Canton of Valais, Switzerland)

People don't tend to visit Sion in May since it is known as a chilly month. The average maximum daytime temperature in Sion in May lies at 8.9°C (48.02°F). The average minimum temperature goes down to around 2.1°C (35.78°F) (often the minimum temperature is noted at night).

May is part of the rainy season with an average precipitation of 192mm (7.5 inches). There are generally around 18 rainy days. If you enjoy blue skies and sunshine, then this is a great time to go to Sion with 230 hours of sun during the entire month.


Sion, monthly averages in May

Show in Fahrenheit
Min Temperature 2 °C  
Max Temperature 8 °C  
Chance of Rain 63%  
Precipitation 191mm  
Rainy days 19 days  
Humidity 62% *  
Sunshine 230 hrs *  
Percentage Sunshine 56% *  

Where to stay in Sion

Where to go in Switzerland in May

Find out more about the weather in Switzerland in May and which places have the best weather conditions in this month.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20-29ºC / 68-84ºF and not too much precipitation (less than 90mm / 3.5inches a month).

So what to wear in May? Visitors traveling to Sion should plan on bringing a totally waterproof coat since it will often be raining. However, also plan on bringing your warm clothes since it can be a bit chilly during this period.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in May.

Outdoor sports

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in Sion.

Our site offers climate and forecast data for every country in the world. Are you going to Switzerland? On this website you can find historical weather averages for many cities in Switzerland. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.