New Zealand’s general insurance market enters its highest-risk seasonal outlook in years carrying a set of structural vulnerabilities that a “very strong” El Niño would directly test: a soft market that Gallagher warned in March 2026 was approaching a profitability inflection within six months, a public disaster scheme that Treasury’s own analysis gives only a 38% chance of sufficiency, and a storm frequency rate that IAG’s claims data shows has more than doubled.
Earth Sciences New Zealand (ESNZ) placed a 90% probability on El Niño reaching or surpassing “very strong” intensity during the outlook period in its Seasonal Climate Outlook cited by 1News on July 31, 2026, with peak conditions and “potential significant impacts” expected during the 2026-27 summer. The five benchmark events that define this category – 1972, 1982, 1991, 1997, and 2015 – each registered sea surface temperature anomalies near or slightly above 2.5°C. ESNZ said the event was currently in its early stages, with full impacts on New Zealand’s weather patterns anticipated to emerge progressively through the outlook period.
Before El Niño peaks, the market has already absorbed a step-change in loss frequency. The AMI, State, and NZI Wild Weather Tracker documented 46 storms in the 12 months to February 28, 2026, generating 33,174 storm-related claims – a 256% increase on the prior year’s 9,324 claims from 29 storms. IAG NZ CEO Phil Gibson said: “Over a 15-year timeline, a storm typically affected parts of the country once every 19 days. In the last 12 months, that frequency has more than doubled to once every eight days, making storms a near-weekly occurrence.”
According to the Insurance Council of New Zealand (ICNZ) Cost of Natural Disasters database, 2026 has already recorded a January event generating $75.9 million from 5,347 claims and a February event at $83.9 million from 10,336 claims, while the full-year 2025 extreme weather total reached $278.2 million. Against that backdrop, IAG NZ CEO Amanda Whiting stated in the company’s FY25 results: “New Zealand is highly exposed to natural hazards and weather-related disasters and their growing impacts. We must remain financially strong to be able to pay claims and help our customers recover from the next big event.”
The profitability that currently cushions carriers against El Niño exposure was itself a product of unusually benign weather. Gallagher’s March 2026 Insurance Market Update noted that IAG recorded profit growth of approximately 50% for the year to June 2025, Suncorp above 40%, and QBE 27% in its June 2025 half-year result – results supported by natural disaster costs running AU$156 million below IAG’s own allowance. Both IAG and Suncorp subsequently reported declining New Zealand gross written premium, with IAG’s intermediated business falling 10.4% and Suncorp’s New Zealand GWP declining 5.6%. Gallagher warned of a possible profitability “tipping point” within six months, noting that decreasing premiums and normalising claims volumes could cross over and trigger a flattening of the market – with the first sign being insurers becoming “far more selective about which risks they offer pricing relief to.” A confirmed “very strong” El Niño season would accelerate that crossover materially.
ESNZ’s outlook points to a pronounced regional divergence: rainfall below normal across much of the North Island and eastern regions of both islands, while the West Coast and lower South Island face above-normal precipitation with an increasing probability of heavy rain and strong wind events as spring progresses. The agency said heavy rain threats had already shifted away from the north: “The main heavy rain threat instead is expected to shift toward the western and lower South Island.”
Vero’s Climate Change Scenario Analysis adds quantitative weight to the accumulation risk within this geography: fewer than 2% of inland properties account for approximately 30% of projected flood-related losses, making accumulation management as much a geographical challenge as a pricing one. For eastern regions, the exposure runs in the opposite direction. ESNZ principal forecasting scientist Chris Brandolino warned at the time of the official El Niño declaration in July 2026 that parts of Canterbury were already experiencing meteorological drought. “Right now, they are in meteorological drought in parts of Canterbury... To have drought in winter, that’s really remarkable,” Brandolino told RNZ.
A January 2026 Cabinet paper confirmed the Natural Hazards Commission’s (NHC) levy sits at 16 cents per $100 of building cover, against a technical rate of 24 cents needed to meet expected long-run costs, leaving the scheme with only a 38% probability of sufficiency over five years at the current rate. The NHC’s reinsurance programme, which provides $10.3 billion in cover from June 2025, does not activate until claims exceed $2.1 billion per event – a threshold the fund must meet from its own reserves, currently estimated at approximately $670 million, backed by a Crown guarantee.
The Reserve Bank of New Zealand’s (RBNZ) May 2026 Financial Stability Report identified affordability, underinsurance, and insurer retreat from flood-exposed areas as pressures that “indicate financial stability risks may increase.” ESNZ noted it was also monitoring the possibility of a rare Southern Hemisphere sudden stratospheric warming event, which if it occurred would carry additional potential to influence the country's weather patterns – an uncertainty the agency said warranted continued observation.
