Chamonix weather in August
August in Chamonix: warm, rainy, with clean air — one of the weakest months to visit.
#11 of 12 months in Chamonix · #597 of 604 destinations to visit in August · comfort 18/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Chamonix climate normals — August
| Daytime high | 23°C / 73°F | 🌤 warm |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 128 mm / 5 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 69% | 💧 humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 14.1 h | |
| Wind | 7 km/h / 4 mph | |
| Snowfall | 0.7 cm / 0.3 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Chamonix?
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Chamonix in August — FAQ
- Is August a good time to visit Chamonix?
- August in Chamonix: warm, rainy, with clean air — one of the weakest months to visit. It ranks #11 of 12 months for Chamonix on SeasonMap's comfort score (18/100).
- What is the weather like in Chamonix in August?
- In August, Chamonix averages a daily high of 22.8°C and a low of 13.3°C, with about 128.1 mm of rain over roughly 14.4 rainy days.
- What is the air quality in Chamonix in August?
- Chamonix has a mean US Air Quality Index of about 39 in August.