Interlaken 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
Good
Best time to visit: May – October
Best for skiing: January – March
What is the weather like in Interlaken in September?
In September, Interlaken is mild: daytime highs average 19 °C, and nights cool down to about 10 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 88 mm in total. All in all, September is a good month for a holiday in Interlaken.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 72 | 71 | 60 |
| Day | 22° | 19° | 15° |
| Night | 13° | 10° | 6° |
| Sun | 6 h | 5 h | 3 h |
| Rain days | 13 | 12 | 12 |
More details for September
- Daylight
- 12 h 38 min07:05 – 19:43
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 10 km/haverage daily peak
- Cloud cover
- 62 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Zurich
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %35 %
- Few rainy daysweight 30 %46 %
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
- Rain jacket or umbrella
Interlaken in September: quick answers
Is Interlaken hot in September?
No. In September, Interlaken is mild: daytime highs average 19 °C and nights drop to about 10 °C.
Does it rain much in Interlaken in September?
Rain is frequent, with about 12 rainy days and 88 mm in total.
Interlaken month by month
The whole year in InterlakenAll 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)