Sion weather in September (Canton of Valais, Switzerland)

How's the weather trend in Sion as September approaches? Wondering about the weather this month? Our guide has all the details you need.

Temperatures

The month of September in Sion typically includes moderate temperatures and high rainfall. Expect the temperatures during the day to hover around 15°C. At night, they will likely drop to about 3°C.

Precipitation

Sion in September usually receives high rainfall, averaging around 127 mm for the month. Historically, the month has about 14 days of rain.

Average sunshine

Enjoy a sunny month with about 210 hours of sunshine, providing a cheerful and lively atmosphere.

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 Temperature 3°C  

Max Temperature 15°C  

Chance of Rain 47%  

Precipitation 127 mm  

Rainy days 14 days  

Humidity 71%  

Windspeed 7 km/h  

Sunshine 210 hours  

Percentage Sunshine 65%  

Where to go in Switzerland in September

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

Weather conditions Weather

Temperatures

Precipitation

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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 this month?

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.

Swimming

4/10

Cycling

5/10

Walking

5/10

Camping

3/10

Outdoor sports

9/10

Interested in more climate information?

This site 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 travel conditions. Find out where to go with our weather planner.