August in Bontang is the sunniest month of the year. In August, the weather in Bontang is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Bontang has 25 rainy and 6 sunny days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Bontang.