Sion Weather in September

Sion in September averages 15°C (59°F) during the day and 3°C (37°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Sion in September

Climate statistics over the past 30 years suggest around 14 days of rain, with 127 mm (5 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Sion in September

In September, Sion sees moderate temperatures, with highs of 15°C (59°F). Nights drop to around 3°C (37°F). Conditions are often most pleasant around the middle of the day. Nights drop to 3°C (37°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Sion in September

Expect a lot of sunshine this month, with about 210 hours of sun. These sunny conditions help offset the cool temperatures, making it a pleasant month to explore outdoors.

Wind Speed in Sion in September

Average wind conditions reach 2 m/s (4 knots) in September. This creates comfortable weather with light winds that gently move vegetation. Keep in mind this is an average. Daily conditions range from near-calm to more noticeable wind.

If you prefer dry days with pleasant temperatures, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.