Chamonix climate by month
In Chamonix, the warmest month is July, with average highs of 19.2 °C, and the coldest is January, with average lows of -9.8 °C. About 1226 mm of rain falls each year over 171 days; May is the wettest month (129 mm) and April the driest (75 mm).
Best time to visit Chamonix: for mild, mostly dry days, aim for July, August.
| Month | Avg high | Avg low | Rain | Rainy days |
|---|---|---|---|---|
| January | -2.1 °C | -9.8 °C | 123 mm | 14 |
| February | -0.6 °C | -8.5 °C | 77 mm | 11 |
| March | 2.2 °C | -6 °C | 102 mm | 14 |
| April | 7.6 °C | -1.8 °C | 75 mm | 13 |
| May | 12 °C | 2.4 °C | 129 mm | 20 |
| June | 17 °C | 7.6 °C | 117 mm | 18 |
| July | 19.2 °C | 9.3 °C | 86 mm | 13 |
| August | 19.2 °C | 8.9 °C | 90 mm | 13 |
| September | 15.3 °C | 5.2 °C | 90 mm | 13 |
| October | 11.5 °C | 1.6 °C | 103 mm | 14 |
| November | 4.1 °C | -3.6 °C | 105 mm | 14 |
| December | 0.2 °C | -6.9 °C | 129 mm | 14 |
2015–2024 averages computed from NASA POWER data (about 50 km grid: values may differ slightly from a city weather station, especially on the coast or in the mountains).
Frequently asked questions
What is the 15-day weather forecast for Chamonix?
The first 10 days come from the forecast model of the Norwegian Meteorological Institute (MET Norway), updated several times a day. After that, we show the outlook: the normal temperatures in Chamonix for the time of year and the chance of rain, based on the last 10 years.
Is there a 30-day forecast for Chamonix?
No model can reliably forecast the weather on a specific day 30 days ahead. The outlook shows what is typical in Chamonix at that time of year: a good basis for planning a trip, to be checked against the 10-day forecast as the date gets closer.
What is the hottest month in Chamonix?
July, with average highs of 19.2 °C. The coldest month is January, with average lows of -9.8 °C.
What is the rainiest month in Chamonix?
May. The driest month is April. On average it rains on 171 days a year in Chamonix, for about 1226 mm of precipitation.
How can I check past weather in Chamonix?
Pick a date in the "Past weather" section to see the high and low temperatures and the rain recorded that day, how it compared with normal, and the same day in previous years.
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