September in Whangamata is the rainiest and the cloudiest month of the year. In September, the weather in Whangamata is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Whangamata has 14 rainy, 8 sunny, 7 partly cloudy, and 1 cloudy day in September. The rains are usually moderate. September as well as June, July, and August is considered the most uncomfortable time to visit Whangamata.