In September, the weather in Kaikoura is typically warm. Average daily high temperature in September is about 11 degrees above zero. On average, Kaikoura has 11 rainy, 10 sunny, 6 partly cloudy, and 3 cloudy days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Kaikoura.