September in Noumea is the sunniest month of the year. In September, the weather in Noumea is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Noumea has 13 sunny, 10 partly cloudy, and 7 rainy days in September. The rains are usually moderate. September as well as August is considered the most comfortable time to visit Noumea.