August in Kaikoura is the sunniest month of the year. In August, the weather in Kaikoura is typically cold. Average daily high temperature in August is about 8 degrees above zero. On average, Kaikoura has 11 rainy, 11 sunny, 6 partly cloudy, and 3 cloudy days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Kaikoura.