Chamonix weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: June – September
Best for skiing: December – March
What is the weather like in Chamonix in August?
In August, Chamonix is warm: daytime highs average 22 °C, and nights cool down to about 12 °C. The sun shines for around 7 hours a day. It rains often – on about 14 days, adding up to 139 mm. All in all, August is a good month for a holiday in Chamonix.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 71 | 71 | 71 |
| Day | 21° | 22° | 18° |
| Night | 12° | 12° | 8° |
| Sun | 8 h | 7 h | 6 h |
| Rain days | 15 | 14 | 13 |
More details for August
- Daylight
- 14 h 12 min06:31 – 20:44
- UV index
- 8 · very highclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 8 km/haverage daily peak
- Cloud cover
- 53 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %65 %
- Few rainy daysweight 30 %27 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Mountain air”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Chamonix in August: quick answers
Is Chamonix hot in August?
Warm rather than hot: in August, daytime highs in Chamonix average 22 °C and nights cool to about 12 °C.
Does it rain much in Chamonix in August?
It rains often – on about 14 days, adding up to 139 mm.
Chamonix month by month
The whole year in ChamonixAll destinations: France
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)