January in Serang is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Serang is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Serang has 29 rainy and 2 cloudy days in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Serang.