New Zealand’s 4th-warmest July on recordJuly 2025 mean sea level air pressure was higher than normal to the southeast of Aotearoa New Zealand, mostly near normal over the country, and lower than ...

New high-resolution modelling predicts that rainfall from tropical cyclones will significantly increase under global warming.

Regional predictions for August – October 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 ...

An experiment in Henderson Creek, Auckland, has demonstrated how tidal creeks variously import, export and deposit sediment, depending on the wind and freshwater runoff, and modulated by the tide.

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.

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, ...

The risk of undersea landslides and their potential to cause tsunamis along New Zealand’s east coast is being investigated by scientists aboard the German research vessel RV Sonne as part of a ...

January 2025 was characterised by lower than normal mean sea level pressure (MSLP) to the east of Aotearoa New Zealand, with more southeasterly airflows than normal. This contributed to temperatures ...