July in Leukerbad is the warmest month of the year. In July, the weather in Leukerbad is typically warm. Average daily high temperature in July is about 14 degrees above zero. On average, Leukerbad has 22 rainy and 9 sunny days in July. The rains are usually heavy. July as well as April, May, June, and August is considered the most uncomfortable time to visit Leukerbad.