January in Semarang is the rainiest, the windiest, and the cloudiest month of the year. In January, the weather in Semarang is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Semarang has 31 rainy 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 Semarang.