August in Auckland is the rainiest month of the year. In August, the weather in Auckland is typically warm. Average daily high temperature in August is about 13 degrees above zero. On average, Auckland has 18 rainy, 9 sunny, 3 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Auckland.