Source: NIWA
Air temperatures are expected to be above average across all New Zealand regions for this winter season, according to NIWA's Seasonal Climate Outlook for June – August 2025. While cold snaps and frost will occur, they are expected to be less frequent than usual, says NIWA Principal Scientist Chris Brandolino.
Rainfall totals during the three months ahead are expected to be above normal for the north of the North Island and near normal for the east of the South Island. For all remaining regions of the country, rainfall is forecast to be near normal or above normal.
Higher than normal atmospheric pressure is expected to the east of the country, leading to north-easterly flow anomalies that may shift to a more north-westerly direction towards the end of the three-month period. Low pressure systems forming north of the country are still expected to affect New Zealand and may lead to heightened risks for heavy rainfall events.
More – including what it means for where you are:
Please see the attached Word or PDF for the full Seasonal Climate Outlook for June – August 2025, including background, summaries, graphs and regional outlooks .
The SCO is also available via the NIWA website: Seasonal Climate Outlook June – August 2025 | NIWA
Watch the video presentation of the Seasonal Climate Outlook with Principal Scientist – Forecasting and Media, Chris Brandolino for more detailed week-by-week rainfall tr