April in Rabaul is the rainiest month of the year. In April, the weather in Rabaul is typically hot. Average daily high temperature in April is about 29 degrees above zero. On average, Rabaul has 22 rainy, 5 sunny, and 3 cloudy days in April. The rains are usually heavy. April as well as March, May, June, and July is considered the most uncomfortable time to visit Rabaul.