In September, the weather in Livigno is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Livigno has 11 rainy, 7 partly cloudy, 6 cloudy, 5 sunny, and 1 snowy day in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Livigno.