August in Brno is the sunniest month of the year. In August, the weather in Brno is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Brno has 15 sunny, 12 partly cloudy, and 4 rainy days in August. The rains are usually light. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Brno.