Best year time to visit Sion

General weather information about Sion

Average annual temperature is 11.8 °C

Absolute maximum temperature: 38.2 °C

Absolute minimum temperature: -5.2 °C

Number of sunny days: 173 days

Number of rainy days: 188 days

Number of snow days: 4 days

Look at detailed online map of Sion

* Weather data for Sion France is based on climate observations for 2026 year

Sion air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)13.314.418.821.024.731.135.638.230.825.914.511.3
Average daytime temperature (°C)5.89.312.113.718.926.027.328.325.118.89.27.2
Average temperature (°C)2.53.46.98.714.020.121.422.219.013.55.93.5
Average night temperature (°C)-0.6-1.42.23.89.113.915.616.013.28.92.50.1
Absolute minimum temperature (°C)-5.2-4.1-2.8-1.56.110.110.38.96.53.5-4.2-5.1

Sion monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.110.411.913.614.915.715.314.112.510.99.58.7
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.08.08.0
Sunshine mean duration (h)4.58.27.38.510.712.912.710.810.37.73.83.9
Precipitation (mm)945136987855825989208192189
Sunny days1821121081314201817814
Rainy days13517202317171112142217
Snow days022000000000

Sion - weather forecast by months

Sion weather in januarySion weather in februarySion weather in marchSion weather in aprilSion weather in maySion weather in juneSion weather in julySion weather in augustSion weather in septemberSion weather in octoberSion weather in novemberSion weather in december

Best time to visit Sion:

The best time to visit Sion during the most sunny months:

  • May — 10.7(h)
  • June — 12.9(h)
  • July — 12.7(h)
  • August — 10.8(h)

Months with the longest average daylight duration in Sion:

  • June — 15.7(h)
  • July — 15.3(h)

The largest precipitation sum in Sion is at

  • March — 136(mm)
  • October — 208(mm)
  • November — 192(mm)
  • December — 189(mm)

    • Weather forecast in the closest to Sion admin centers

    Weather forecast in the closest towns to Sion

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    Frequently asked questions

    When is the best time to visit Sion?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Sion.
    What is the weather like in Sion?
    See average temperature, rainfall and daylight hours for Sion by month in the table above.
    How many sunny days does Sion have?
    The monthly weather statistics above show sunshine and rainfall patterns for Sion throughout the year.