Interlaken weather in September
September in Interlaken: nice, rainy, with clean air — an excellent time to visit.
#3 of 12 months in Interlaken · #222 of 604 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Interlaken climate normals — September
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 142 mm / 5.6 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 14°C / 56°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12.5 h | |
| Wind | 8 km/h / 5 mph | |
| Snowfall | 4.4 cm / 1.7 in | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Interlaken in September — FAQ
- Is September a good time to visit Interlaken?
- September in Interlaken: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Interlaken on SeasonMap's comfort score (84/100).
- What is the weather like in Interlaken in September?
- In September, Interlaken averages a daily high of 21°C and a low of 11.9°C, with about 142 mm of rain over roughly 13.8 rainy days.
- What is the air quality in Interlaken in September?
- Interlaken has a mean US Air Quality Index of about 35 in September.
- Does it snow in Interlaken in September?
- Interlaken sees roughly 4.4 cm of snowfall in September.