August in Avarua is the coldest month of the year. In August, the weather in Avarua is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Avarua has 14 partly cloudy, 12 sunny, and 5 rainy days in August. The rains are usually heavy. August as well as June and July is considered the most comfortable time to visit Avarua.