St. Moritz weather in September
September in St. Moritz: cool, rainy, with clean air — a fair time to visit.
#9 of 12 months in St. Moritz · #539 of 604 destinations to visit in September · comfort 57/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
St. Moritz climate normals — September
| Daytime high | 14°C / 57°F | 🙂 cool |
|---|---|---|
| Nighttime low | 5°C / 41°F | |
| Feels like (high) | 13°C / 55°F | |
| Rainfall | 113 mm / 4.5 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 6°C / 43°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12.5 h | |
| Wind | 8 km/h / 5 mph | |
| Snowfall | 18.8 cm / 7.4 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. Moritz in September — FAQ
- Is September a good time to visit St. Moritz?
- September in St. Moritz: cool, rainy, with clean air — a fair time to visit. It ranks #9 of 12 months for St. Moritz on SeasonMap's comfort score (57/100).
- What is the weather like in St. Moritz in September?
- In September, St. Moritz averages a daily high of 13.9°C and a low of 5.2°C, with about 113.2 mm of rain over roughly 12.8 rainy days.
- What is the air quality in St. Moritz in September?
- St. Moritz has a mean US Air Quality Index of about 39 in September.
- Does it snow in St. Moritz in September?
- St. Moritz sees roughly 18.8 cm of snowfall in September.