January in Christchurch is the warmest month of the year. In January, the weather in Christchurch is typically warm. Average daily high temperature in January is about 22 degrees above zero. On average, Christchurch has 9 sunny, 8 rainy, 8 partly cloudy, and 6 cloudy days in January. The rains are usually moderate. January as well as February and March is considered the most comfortable time to visit Christchurch.