St. Moritz weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: July – August
Best for skiing: November – April
What is the weather like in St. Moritz in September?
In September, St. Moritz is cool: daytime highs average 13 °C, and nights cool down to about 4 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 118 mm in total. Snow falls on about 3 days. All in all, September is a so-so month for a holiday in St. Moritz.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 64 | 51 | 29 |
| Day | 17° | 13° | 8° |
| Night | 7° | 4° | 0° |
| Sun | 6 h | 5 h | 5 h |
| Rain days | 16 | 13 | 12 |
More details for September
- Daylight
- 12 h 38 min06:57 – 19:35
- UV index
- 5 · moderateclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 7 km/haverage daily peak
- Cloud cover
- 70 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 3 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Zurich
How the score comes together
- Temperatureweight 50 %67 %
- Sunshineweight 20 %37 %
- Few rainy daysweight 30 %33 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Mountain air”.
What to pack in September
- Sunscreen
- A jumper for the evenings
- Hat, scarf & gloves
- Rain jacket or umbrella
St. Moritz in September: quick answers
Is St. Moritz hot in September?
No. In September, St. Moritz is cool: daytime highs average 13 °C and nights drop to about 4 °C.
Does it rain much in St. Moritz in September?
Rain is frequent, with about 13 rainy days and 118 mm in total.
St. Moritz month by month
The whole year in St. MoritzAll destinations: Switzerland
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)