Christchurch - Five-Day Weather ForecastChristchurch ClimateLocated in New Zealand’s South Island, Christchurch is a great place for a great holiday. Generally mild and temperate, Christchurch’s weather is often cooler than in most other parts of New Zealand - especially during the winter months from June to August. Christchurch is positioned on the eastern side of South Island and is less affected by rainfall, although on a few occasions quick changes in the weather occur and a few showers can be expected. The warmest period in Christchurch is during summertime - when the temperature can exceed 25ºC (77ºF) - the perfect conditions for outdoor activity.