ClimateForecastDecemberJanuary >>

Sion Climate by Month

Sion experiences great temperature shifts. The city's weather can transition from pleasant days to very cold weather. It is also known for its large amounts of rain/snowfall. Now, let’s explore all the climate details to give you a full picture.

Average day and night temperature

The climate in Sion is known for significant temperature differences throughout the year, making the weather dynamic. Typically, daytime temperatures range from a pleasant 19°C in July to a very cold -3°C in the coolest month, January. Nights are cooler, with temperatures generally dropping to -13°C, particularly during the colder months.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

Sion has a notably wet climate with abundant precipitation, recording 1636 mm of rain/snowfall per year. Precipitation levels in Sion remain relatively steady throughout the year. June has the most rain, with 167 mm over 18 days. In October, this drops slightly to 113 mm, making the city's climate fairly predictable.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

For those who appreciate different seasons, Sion serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 9.0 hours of sunshine daily, and embrace the darker days in December, offering only 2.3 hours of daily sunlight.

Monthly hours of sunshine

Daily hours of sunshine

The best time of year to visit Sion in Switzerland

Other facts from our historical weather data:
  • Which months have the greatest rainfall in Sion?
    Most rainfall (rainy season) is seen in May, June, July and August.
  • When is winter in Sion?
    The coldest season / winter is in the following months: January, February, November and December.
  • Which is the warmest month in Sion?
    July has an average maximum temperature of 19°C 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.
  • Which is the wettest month in Sion?
    June tops the wettest month list with 167 mm of rainfall.
  • Which is the driest month in Sion?
    October is the driest month with 113 mm of precipitation.
  • Which is the sunniest month in Sion?
    July is the sunniest month with an average of 270 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

    Forecast for Sion

    Tue   Dec 03
    7°C | 3°C
    W 11 km/h
    0.8 mm
    broken clouds and  chance of slight rain

    broken clouds and chance of slight rain

    Wed   Dec 04
    6°C | 0°C
    N 7 km/h
    almost clear and no rain

    almost clear and no rain

    Thu   Dec 05
    7°C | -3°C
    NE 7 km/h
    broken clouds and no rain

    broken clouds and no rain