July in Gressoney-la-Trinite is the rainiest and the warmest month of the year. In July, the weather in Gressoney-la-Trinite is typically warm. Average daily high temperature in July is about 14 degrees above zero. On average, Gressoney-la-Trinite has 20 rainy, 6 partly cloudy, and 5 sunny days in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Gressoney-la-Trinite.