August in Leukerbad is the sunniest month of the year. In August, the weather in Leukerbad is typically warm. Average daily high temperature in August is about 13 degrees above zero. On average, Leukerbad has 19 rainy, 10 sunny, and 2 partly cloudy days in August. The rains are usually heavy. August as well as April, May, June, and July is considered the most uncomfortable time to visit Leukerbad.