City weather to improve
While severe thunderstorms and flash flooding are forecast for much of the North Island today, the weather is expected to improve in Auckland over the weekend.
MetService has warned that storms may develop this afternoon and evening, from Waikato to Wairarapa.
Auckland was experiencing "quite unstable" weather and may get heavy rain today, a MetService spokeswoman said, but tomorrow was expected to be "not bad at all".
The temperature would remain around 24 degrees Celsius and fine spells were expected in the morning, the spokeswoman said, followed by increased cloud and light rain in the evening.
Showers are expected Sunday and New Year's eve will be fine with a few showers. Tuesday was also expected to be fine with showers.
Temperatures over the next few days would sit about 23 C.
The MetService warned the rest of the North Island could expect slow-moving storms capable of producing flooding rainfall of about 25-40mm an hour.
"Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips, the MetService said.
The warning applies to Waikato, Waitomo, Taumarunui, Taupo, Hawke's Bay, Taranaki, Taihape, Wanganui, Manawatu, Tararua, and Wairarapa.