September in Whangarei is the rainiest month of the year. In September, the weather in Whangarei is typically warm. Average daily high temperature in September is about 16 degrees above zero. On average, Whangarei has 14 rainy, 6 sunny, 6 partly cloudy, and 4 cloudy days in September. The rains are usually heavy. September as well as June, July, August, and October is considered the most uncomfortable time to visit Whangarei.