Those in the South Island and in Wellington should also expect calm weather.
However, temperatures in Canterbury, where thousands of people are still without power, were expected to cool, with daytime temperatures around 13C and night-time temperatures towards freezing.
Christchurch electricity lines company Orion said about 9000 people were still without power yesterday. Most were in the rural region west of Christchurch. However, some smaller areas within Christchurch city were also affected.
Chief executive Rob Jamieson said power had been restored to all the company's major rural substations apart from one in the Burnham area.