France
Chamonix in September: weather & travel advice
This month's data profile
Rain shapes the decision
Chamonix in September is climatically mixed. The average daily high is around 14 °C. With about 13 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
50/100 · #3
Warmth
#4
Dryness
#6
Sun
#6
Published best categories: City break, Active
Chamonix · SeptemberPhoto: Alain Bourque · CC BY 3.0Climate facts
- Average high
- 14 °C
- Average low
- 4 °C
- Rainy days (est.)
- 13 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 77 %
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 | 18 | 8 | 14 | 94 | 6.5 | 73 | 0.8 | 64 |
| September (selected) | 14 | 4 | 13 | 92 | 5.0 | 77 | 0.7 | 50 |
| October | 10 | 1 | 13 | 95 | 3.2 | 79 | 0.8 | 38 |
How do the previous and next months compare?
Baseline: September (50/100)
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 | +14 | +3.7 °C | +3.7 °C | +0.3 | +2 mm | +1.5 h | -4 % | ±0 m/s |
| October | -12 | -4.1 °C | -3.5 °C | -0.2 | +3.1 mm | -1.8 h | +2.1 % | ±0 m/s |
All twelve months in context
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Where to stay in Chamonix
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Useful next decisions
Frequently asked questions
How warm is Chamonix in September?
The average daily high is around 14 °C, with an average daily low of about 4 °C.
Does it rain a lot in Chamonix in September?
The curated estimate is about 13 rainy days per month, not a directly measured long-term average. Total precipitation averages around 92 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Chamonix?
By the climate score, August are the strongest months for Chamonix. September is not among them.