January in Alotau is the rainiest, the cloudiest, and the hottest month of the year. In January, the weather in Alotau is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Alotau has 29 rainy and 2 sunny 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 Alotau.