A woman in a blue and orange outfit is running in the mountains

September in Chamonix: What's on and weather

A sense of calm settles over the mountains after the busy summer, and there's a hint of a chill in the air

Imprint: By Tracy Wise, Updated 25 September 2025

One of the best times to visit Chamonix, there's plenty to see and do before autumn arrives.

Whilst the crowds may have dispersed, there is still lots to see and do in Chamonix at this time of year. In fact it's the perfect time to visit. The weather is usually good, and that means there's still plenty of opportunity to get out and about in the valley, unimpeded by the crowds, and it's definitely easier to get a table in a restaurant and a seat on a terrace.

This is when we like to go trail running, hiking, biking, and climbing, but without the crowds. Plus there's always time for some relaxation when you come to Chamonix.

Read on for a look at what we like to do in resort throughout September.

What's the weather like in Chamonix in September?

The temperatures are only a few degrees cooler than the height of summer, with lows of around 9°C and highs of 19ºC, and on average around 10 days of rain.

See our Summer Lift Passes

What's on in Chamonix in September?

The Trail des Aiguilles Rouges

Just because the UTMB is over, doesn't mean there are no trails to be run. The TAR is a prestigious trail running race in the Chamonix valley that gives athletes some of the most iconic and fantastic views of Mont Blanc. Starting from the town of Chamonix, the route climbs high up into the Aiguille Rouges nature reserve, taking a different path each year. Not for the faint-hearted (or the unprepared), the race covers a distance of 54km and a total ascent of over 4,000m. Top runners can complete this race in around 6.5h but, for many, it will mean a long day of running lasting between 10 to 13 hours. If you don't want to take part, then supporting the event and watching along the way can be just as fun.

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Things to do

The Tramway du Mont Blanc

Open until the end of September, this trainline is the highest in France and fourth highest in Europe, reaching over 2,000m above sea level. Its locomotives have charming first names, Anne, Jeanne and Marie, and give you access to the Nid d'Aigle (Eagle's Nest), which at +2,380m is the gateway for mountaineers to one of Mont Blanc's ascents, and offers exceptional views of the Bionnassay glacier.

La Folie Douce closing party

La Folie Douce say farewell to the summer season with a bang in Chamonix, hosting a themed party mid to late September. Whatever the theme you can be sure of fantastic food, drinks, and incredible performers to welcome you throughout the day and night. There are usually workshops where you can learn how to mix the perfect cocktails, along with crafts and musical entertainment.

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