January in Wamena is the rainiest, the windiest, and the cloudiest month of the year. In January, the weather in Wamena is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Wamena 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 Wamena.