Climate in Sion (Canton of Valais), Switzerland

The graphs below show the monthly weather averages over the year.

Average day and night temperature

The mean minimum and maximum temperatures over the year. Show in Celsius

Average min and max temperatures in Sion, Switzerland   Copyright © 2022  weather-and-climate.com

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Monthly hours of sunshine

The average monthly total hours of sunshine over the year

Average monthly sunhours in Sion, Switzerland   Copyright © 2022  weather-and-climate.com

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Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc. Show in Millimeter

Average precipitation (rain/snow) in Sion, Switzerland   Copyright © 2022  weather-and-climate.com

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Average humidity

The mean monthly relative humidity over the year

Average relative humidity in Sion, Switzerland   Copyright © 2022  weather-and-climate.com

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Average wind speed

The mean monthly wind speed over the year (in meters per second)

Average wind speed in Sion, Switzerland   Copyright © 2022  weather-and-climate.com

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Weather Forecasts for Sion (Canton of Valais)

THU Jan 20
25°F | 11°F
Light freezing rain

Light freezing rain

FRI Jan 21
23°F | 4°F
Light freezing rain

Light freezing rain

SAT Jan 22
30°F | 8°F
Sunny

Sunny

The best time of year to visit Sion in Switzerland

During the month of May, June, July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20 degrees Celsius (68°F) and 25 degrees Celsius (77°F).

Other facts from our historical climate data:

  • Which is the warmest month in Sion?
    July has an average maximum temperature of 25°C (77°F) and is the warmest month of the year.
  • Which is the coldest month in Sion?
    The coldest month is January with an average maximum temperature of 3°C (37°F).
  • Which is the wettest month in Sion?
    August tops the wettest month list with 63mm (2.5in) of rainfall.
  • Which is the driest month in Sion?
    April is the driest month with 36mm (1.4in) of precipitation.
  • Which is the sunniest month in Sion?
    July is the sunniest month with an average of 267 hours of sunshine.

  • 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.