May in Auckland is the sunniest month of the year. In May, the weather in Auckland is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Auckland has 13 rainy, 8 sunny, 7 partly cloudy, and 3 cloudy days in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Auckland.