August in Kongsberg is the rainiest month of the year. In August, the weather in Kongsberg is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Kongsberg has 20 rainy, 7 sunny, and 4 partly cloudy days in August. The rains are usually heavy. August as well as March, April, May, and June is considered the most uncomfortable time to visit Kongsberg.