St. Gallen weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: June – September
What is the weather like in St. Gallen in September?
In September, St. Gallen is mild: daytime highs average 17 °C, and nights cool down to about 9 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 127 mm in total. All in all, September is a good month for a holiday in St. Gallen.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 65 | 63 | 40 |
| Day | 21° | 17° | 14° |
| Night | 13° | 9° | 5° |
| Sun | 7 h | 5 h | 3 h |
| Rain days | 17 | 14 | 13 |
More details for September
- Daylight
- 12 h 39 min06:58 – 19:37
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 10 km/haverage daily peakAll months
- Cloud cover
- 62 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+2Europe/Zurich
How the score comes together
- Temperatureweight 50 %94 %
- Sunshineweight 20 %35 %
- Few rainy daysweight 30 %30 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
St. Gallen in September: quick answers
Is St. Gallen hot in September?
No. In September, St. Gallen is mild: daytime highs average 17 °C and nights drop to about 9 °C.
Does it rain much in St. Gallen in September?
Rain is frequent, with about 14 rainy days and 127 mm in total.
St. Gallen month by month
The whole year in St. GallenAll destinations: SwitzerlandWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences