Switzerland
Interlaken in September: weather & travel advice
This month's data profile
Rain shapes the decision
Interlaken in September is climatically mixed. The average daily high is around 13 °C. With about 16 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
39/100 · #4
Warmth
#4
Dryness
#6
Sun
#6
Published best categories: none
Interlaken · SeptemberPhoto: André Schakkal · CC BY-SA 4.0Climate facts
- Average high
- 13 °C
- Average low
- 4 °C
- Rainy days (est.)
- 16 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 81 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Score |
|---|---|---|---|---|---|---|---|---|
| August | 17 | 7 | 18 | 149 | 6.2 | 77 | 1.1 | 50 |
| September (selected) | 13 | 4 | 16 | 123 | 4.7 | 81 | 1.2 | 39 |
| October | 8 | 0 | 15 | 112 | 3.2 | 83 | 1.3 | 30 |
How do the previous and next months compare?
Baseline: September (39/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | |
|---|---|---|---|---|---|---|---|---|
| August | +11 | +3.9 °C | +3.7 °C | +1.8 | +25.7 mm | +1.5 h | -3.4 % | -0.1 m/s |
| October | -9 | -4.3 °C | -3.5 °C | -0.7 | -11.4 mm | -1.5 h | +2.1 % | +0.1 m/s |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Interlaken in September?
The average daily high is around 13 °C, with an average daily low of about 4 °C.
Does it rain a lot in Interlaken in September?
The curated estimate is about 16 rainy days per month, not a directly measured long-term average. Total precipitation averages around 123 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Interlaken?
No month in Interlaken reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.