Chamonix weather
Ten-year climate averages, month by month
Chamonix in september
Current month averages, based on ten years of records. Read the full guide →
Chamonix-Mont-Blanc is a resort in the French Alps at the foot of Mont Blanc, the highest summit in Western Europe. Birthplace of extreme alpinism and host of the first Winter Olympics in 1924.
The year in weather
Chamonix weather by month
Pick a month for the full climate guide — temperature, rainfall, sunshine, packing tips and hotel deals for Chamonix.
Places that feel like Chamonix in september
Chamonix weather — FAQ
Q01Which month is warmest in Chamonix?
Which month is warmest in Chamonix?
July runs the highest averages in Chamonix, with typical daytime highs of 23°C (74°F). Valley floor hits 30C in August; locals bathe in Lac des Gaillands or ride Brevent lift to alpine 20C air; via ferrata guides start at 6am.
Q02Which month is chilliest in Chamonix?
Which month is chilliest in Chamonix?
January brings the lowest averages, with daytime highs near 4°C (39°F). January minus 20C on Grands Montets; the Vallee Blanche off-piste needs a guide and crevasse rescue kit, not enthusiasm and a GoPro.
Q03When is the rainy season in Chamonix?
When is the rainy season in Chamonix?
May typically records the highest monthly rainfall — around 194mm on average. Late spring rain in the valley means fresh snow up high; ski touring windows open, but the Chamonix-Argentiere road slushes to a crawl.
Q04How would you describe Chamonix's weather?
How would you describe Chamonix's weather?
Chamonix, France has mild summers, cold winters, moderate seasonal rainfall. Chamonix is a mountaineering town, not a resort; the guide bureau in the town square is the real command center. Le Panier des 4 Saisons or Munchies are locals' post-ski food, not the Rue Vallot tourist strip. Argentiere is quieter than Chamonix center and closer to the Grands Montets lift. Never underestimate the Aiguille du Midi 3800m altitude jolt; walk slowly the first 20 minutes or headache guaranteed. The PGHM rescue helicopters fly daily; respect the closure signs on the glacier. You can read the detailed month-by-month breakdown on this page.