Switzerland
St. Moritz in September: weather & travel advice
This month's data profile
Rain shapes the decision
St. Moritz in September is climatically mixed. The average daily high is around 12 °C. With about 15 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
38/100 · #4
Warmth
#4
Dryness
#8
Sun
#6
Published best categories: none
St. Moritz · SeptemberPhoto: Isiwal · CC BY-SA 4.0Climate facts
- Average high
- 12 °C
- Average low
- 2 °C
- Rainy days (est.)
- 15 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 | 16 | 6 | 18 | 136 | 6.2 | 78 | 1.0 | 45 |
| September (selected) | 12 | 2 | 15 | 113 | 4.8 | 81 | 1.0 | 38 |
| October | 7 | -1 | 14 | 107 | 3.2 | 83 | 1.0 | 31 |
How do the previous and next months compare?
Baseline: September (38/100)
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 | +7 | +3.9 °C | +3.8 °C | +3.2 | +23.5 mm | +1.4 h | -2.9 % | ±0 m/s |
| October | -7 | -4.5 °C | -3.5 °C | -1.3 | -6 mm | -1.6 h | +2.3 % | ±0 m/s |
All twelve months in context
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Where to stay in St. Moritz
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Useful next decisions
Frequently asked questions
How warm is St. Moritz in September?
The average daily high is around 12 °C, with an average daily low of about 2 °C.
Does it rain a lot in St. Moritz in September?
The curated estimate is about 15 rainy days per month, not a directly measured long-term average. Total precipitation averages around 113 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit St. Moritz?
No month in St. Moritz reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.