August in Mostar is the sunniest and the warmest month of the year. In August, the weather in Mostar is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Mostar has 30 sunny and 1 rainy day 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 Mostar.