January in Bontang is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Bontang is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Bontang has 30 rainy and 1 sunny day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Bontang.