Climate averages 1991–2020
Weather in Switzerland in September
In September, average daytime highs across the 8 cities listed in Switzerland range from 17.2°C in Sankt Gallen to 20.1°C in Basel. Monthly rainfall ranges from 88 mm in Bern to 166 mm in Luzern.
Long-term climate patterns, not a forecast for a particular trip.
City by city
September in Switzerland
| City | Average highHigh / low | Average low | Rainfall mm | Rain days |
|---|---|---|---|---|
| Zürich | 18.9°C11.2°C | 11.2°C | 123 | 12.4 |
| Geneva | 19.8°C11.6°C | 11.6°C | 109 | 12.2 |
| Basel | 20.1°C10.8°C | 10.8°C | 95 | 12.6 |
| Lausanne | 18.8°C13.2°C | 13.2°C | 108 | 11.7 |
| Bern | 17.7°C9.6°C | 9.6°C | 88 | 11.8 |
| Winterthur | 18.7°C10.8°C | 10.8°C | 91 | 11.1 |
| Luzern | 18.9°C11.6°C | 11.6°C | 166 | 15.3 |
| Sankt Gallen | 17.2°C9.2°C | 9.2°C | 127 | 13.7 |
A rain day is a local calendar day with at least 1 mm of precipitation.