The weather in Chamonix in September is very cold with temperatures between 4°C and 13°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Chamonix. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
You can expect a few days of snow in Chamonix during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Chamonix.
Our weather forecast can give you a great sense of what weather to expect in Chamonix in September 2025.
If you’re planning to visit Chamonix in the near future, we highly recommend that you review the 14 day weather forecast for Chamonix before you arrive.
