In October, the weather in Chamonix is typically cold. Average daily high temperature in October is about 10 degrees above zero. On average, Chamonix has 10 rainy, 8 sunny, 8 partly cloudy, 4 cloudy, and 1 snowy day in October. The rains are usually heavy. October as well as April, May, June, and July is considered the most uncomfortable time to visit Chamonix.