Sion weather in September (Canton of Valais, Switzerland)

How is the weather in Sion in September? This guide provides all the details you need.

In September, Sion generally has moderate temperatures and high rainfall. Throughout the daytime, temperatures often hover around 15°C. However, as the sun sets and evening approaches, there's a noticeable cool-down, with temperatures gently dropping to a more temperate 3°C.

Sion in September usually receives high rainfall, averaging around 127 mm for the month. Based on our climate data of the past 30 years, about 14 days of rain are anticipated.

The days are predominantly sunny, with an estimated total of around 210 hours of sunshine. This amount of sunlight does not only brightens the days but also contributes to a cheerful ambiance in the area during this month.

Should you favor a climate that's both dry and comfortably warm July and August typically offer the most agreeable circumstances. On the other hand, January, February, March, April, May, October, November and December tend to be characterized by conditions that may not be as optimal.

For an in-depth look at the yearly conditions, visit our specialized Sion climate page with graphs.

 

Sion, monthly averages in September

Min TemperatureMin Temperature 3°C  
Max TemperatureMax Temperature 15°C  
Chance of RainChance of Rain 47%  
PrecipitationPrecipitation 127 mm  
Rainy daysRainy days 14 days  
HumidityHumidity 71%  
WindspeedWindspeed 7 km/h  
SunshineSunshine 210 hours  
Percentage SunshinePercentage Sunshine 65%  

Where to go in Switzerland in September

Find out more about the weather in Switzerland in September 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°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in Sion in September?

Plan on layering your clothes. Some days or part of the day it will be nice and warm and some moments it can be a bit chilly. Bring a rain jacket in case it rains during your stay.

What To Do

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

Swimming
4/10
Cycling
5/10
Walking
5/10
Camping
3/10
Outdoor sports
9/10

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.