In October, the weather in Aosta is typically cold. Average daily high temperature in October is about 7 degrees above zero. On average, Aosta has 8 rainy, 8 partly cloudy, 7 sunny, 7 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 Aosta.