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