Best Time to Visit Sion, Valais, Switzerland
Month-by-month climate guide for planning a trip to Sion.
Sion does not have a month that clearly fits our sunny profiles. Its practical travel window centres on its warmest (July, 19°C / 66.2°F) and driest (April, 46 mm / 1.8 in) months. The drier stretch runs through March–May and July–September and January; the wetter half falls in February and June and October–December. At the city itself, monthly average temperatures range from 0.1°C / 32.2°F in January to 19°C / 66.2°F in July, with rainfall from 46 mm / 1.8 in (April) to 71 mm / 2.8 in (June). These are point-value climate normals sampled at Sion, Valais, Switzerland's coordinates — usually more actionable for travellers than the country-wide average. Sion's climate is broadly seasonal. The full month-by-month table below lets you match your travel window against our five weather profiles.
Recommended months
| Month | Temp | Rain | Feels like |
|---|---|---|---|
| July | 19°C66.2°F | 64 mm2.5″ | — |
| August | 18.4°C65.1°F | 64 mm2.5″ | — |
| September | 14.7°C58.5°F | 54 mm2.1″ | — |
No month at Sion matches our sunny profiles. The three above are the driest-and-warmest fallback.
Frequently asked questions
When is the best time to visit Sion?
Sion doesn't have a month that clearly matches our sunny profiles. The practical travel window centres on April (driest, ~46 mm / 1.8 in) and July (warmest, 19°C / 66.2°F). Because these are point values at the city, they can differ substantially from Switzerland's national average.
When is the rainy season in Sion?
The rainy season at Sion, Valais runs through February and June and October–December, when monthly rainfall exceeds the annual median of about 64 mm / 2.5 in. The wettest single month is June (71 mm / 2.8 in).
What is the driest month in Sion?
The driest month in Sion is April, averaging about 46 mm / 1.8 in of rainfall. Temperature that month averages 9°C / 48.2°F.
What months should I avoid visiting Sion?
The least comfortable months for travel to Sion — based on point-value climate at the city — are January, February, June, November, December. These are the wettest or coolest months at this location. Rainfall peaks at 71 mm / 2.8 in in June, and the coldest month averages 0.1°C / 32.2°F.
Is Sion climate different from Switzerland overall?
Yes, usually. Our Sion figures are point-value climate normals sampled at the city itself, while our Switzerland figures are area-weighted averages across the whole country. The two can diverge substantially in geographically diverse or elevation-varied countries. The month-by-month table below reflects Sion specifically — usually the more actionable data for a traveller planning to spend time in the city.