Regional predictions for July – September 2025 The tables below show the probabilities (or percent chances) for each of three categories: above average, near average, and below average. In the absence ...

June 2025 mean sea level air pressure was higher than normal to the south of Aotearoa New Zealand, and mostly near normal over the country. This was associated with more easterly winds than normal for ...

Many of our iconic native fish species, such as whitebait and eels, rely on river flows to cue key life-cycle stages, including migration and reproduction. As pressures on water resources increase, ...

A NIWA-led study has found New Zealand’s native forests are absorbing more carbon dioxide (CO2) than previously thought.

Regional predictions for June – August 2025 The tables below show the probabilities (or percent chances) for each of three categories: above average, near average, and below average. In the absence of ...

NIWA welcomes the news its merger with GNS will come into effect by 1 July. The Minister of Science, Innovation, and Technology, Hon. Shane Reti, has announced that our two organisations will join to ...

Seasonal air temperatures are expected to be above average across all New Zealand regions, with particularly warm overnight temperatures driving this trend.

State Owned Enterprises Minister Simeon Brown and Science, Innovation and Technology Minister Shane Reti today jointly announced that Cabinet has agreed to proceed with NIWA’s acquisition of ...

Outlook summary In March 2025, the oceanic markers of La Niña weakened significantly, with most now falling within the ENSO-neutral range. The atmosphere, however, still exhibits signals consistent ...

New Zealand could face twice as many of the most extreme atmospheric rivers by the end of the century, according to new research. Not only could the narrow bands of concentrated water vapour increase, ...

Thirty eight scientists and crew have set sail this week for Antarctica on NIWA’s research vessel Tangaroa, with the aim of going as far south as the Ross Ice Shelf - a first for the ship.

Overview 2024 was Aotearoa New Zealand’s 10th-warmest year on record. The 2024 nationwide average temperature calculated from NIWA’s seven station series was 13.25˚C, being 0.51˚C above the 1991-2020 ...