August in Trbovlje is the sunniest month of the year. In August, the weather in Trbovlje is typically warm. Average daily high temperature in August is about 24 degrees above zero. On average, Trbovlje has 23 sunny, 6 rainy, and 2 partly cloudy days in August. The rains are usually heavy. August as well as July is considered the most comfortable time to visit Trbovlje.