Average weather in September in Sion (Canton of Valais), Switzerland

The average minimum temperature (usually the minimum temperature is noted during the night) in Sion in September is 7.0°C (44.6°F). The amount of rain in September is normal with an average of 45mm (1.8in). The average maximum daytime temperature lies around 20.0°C (68°F). The sun will occasionally show itself with 190 hours of sunshine during the whole month.


So what to wear in September? Bring a rain jacket just in case since it will be raining a few days during this period. 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 just in case since it will be raining a few days during this period. Also bring your shorts or a skirt because it can be very warm or even hot.

No idea where to travel to this year? We now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.

For other monthly average weather and what to do in September look at the numbers below.

Monthly Averages in September

Show in Fahrenheit

Min Temperature 7 °C
Max Temperature 20 °C
Precipitation 45mm
Sunshine Hours 190

Where to stay in Sion

What To Do

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

Swimming
6/10
Cycling
10/10
Walking
10/10
Barbeque
7/10
Camping
5/10
Outdoor sports
10/10

Weather Forecasts for Sion (Canton of Valais)

TUE Dec 07
-2°C | -8°C

Heavy snow

WED Dec 08
-5°C | -8°C

Heavy snow

THU Dec 09
-6°C | -17°C

Heavy snow

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 almost all countries 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 suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.