August in Akaroa is the cloudiest and the coldest month of the year. In August, the weather in Akaroa is typically cold. Average daily high temperature in August is about 9 degrees above zero. On average, Akaroa has 11 rainy, 8 partly cloudy, 6 sunny, and 6 cloudy days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Akaroa.