August in Zagreb is the sunniest and the warmest month of the year. In August, the weather in Zagreb is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Zagreb has 28 sunny and 3 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 Zagreb.