Brokers across the South Island are facing another round of flood-related claims exposure after MetService issued orange heavy rain warnings for multiple alpine regions, with up to 350mm of rainfall expected across the Westland District ranges and peak rates of 20 to 30 mm/h forecast for Monday.
The warnings arrive in a year in which insured weather losses have already reached $264.8 million across four events, according to the Insurance Council of New Zealand (ICNZ) Cost of Natural Disasters database. That follows a full-year 2025 total of $278.2 million.
Milford Sound recorded 73mm of rain over a 12-hour period to Sunday morning, including a burst of 17mm in a single hour between 4am and 5am, according to MetService. Orange warnings cover the Westland District ranges (expiring 6am Tuesday), Canterbury lakes and rivers south of Arthur’s Pass (expiring 2am Tuesday), and Fiordland north of Doubtful Sound. A heavy rain watch covers the headwaters of the Otago lakes and rivers, and a strong wind watch applies to Canterbury High Country.
“Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible,” MetService said.
Read more: How the Kaikōura floods extended the South Island’s costly weather run
The event follows a polar jet stream that brought snow closures to some state highways and strong winds further north last week, according to 1News.
Insurance Australia Group (IAG), which underwrites AMI, State, and NZI in New Zealand, reported $322 million in weather claims from 44 events for the year ended June 30, 2026, up from $132 million the prior year. Vero Insurance recorded $184.6 million in weather-related natural hazard claims over the same period, up from $70.6 million.
IAG’s Wild Weather Tracker recorded 33,174 claims from 46 storms between March 1, 2025, and February 28, 2026, a 256% increase from 9,324 claims across 29 storms in the prior year.
Phil Gibson, Auckland-based CEO of AMI, State, and NZI, said: “Simply put, our data indicates that storms are arriving more often and with greater intensity.”
Gibson’s data shows storms have been arriving roughly once every eight days, compared to a 15-year baseline of once every 19 days.
Southland, despite being the 12th most populous of New Zealand’s 16 regions, accounted for 9% of all natural hazard claims across IAG brands in the 2025-2026 tracking period.
Read more: Why South Island weather is adding to pressure on lower South Island brokers
Under the Natural Hazards Insurance Act 2023, the Natural Hazards Commission (NHC) covers residential land damage from storm and flood events, with building cover capped at $300,000 plus GST per event. Any building damage above that cap falls to private insurers.
The NHC received 824 natural hazard claims in January and February 2026 alone, including 493 for landslide damage and 170 for storm and flood damage to land.
The Insurance Brokers Association of New Zealand (IBANZ) has flagged that some private insurers will not confirm their building-claim portion until NHC settles its component, which can delay claims resolution for months.
Katherine Wilson, Wellington-based CEO of IBANZ, said: “The one thing claims insurers can do to make a broker’s job easier is communicate proactively and consistently.”
An IBANZ survey conducted in June 2026 found more than 60% of responding brokers reported greater difficulty placing cover because of natural hazard and climate-related risks. Nearly nine in 10 said clients were asking for more natural hazard advice. Rothbury’s 2026 commercial market assessment found flood-prone properties and those with repeated claims were already receiving fewer quotes, higher deductibles, and tighter renewal conditions.
These weather events are arriving while the commercial insurance market remains in a soft phase. Gallagher Insurance New Zealand’s September 2026 market update found pricing remained favourable for buyers across most major classes, but noted that rising claims costs were pressuring insurer profitability.
In January 2026, AA Insurance paused new home, business, and landlord policies in Westport, citing flood exposure, according to RNZ. It later extended that pause to Woodend in North Canterbury.
The government’s Our Atmosphere and Climate 2026 report, released in October by the Ministry for Cities, Environment, Regions and Transport (MCERT) and Statistics New Zealand, found about 10,000 homes in Auckland, Christchurch, Wellington, and Dunedin could become increasingly difficult or expensive to insure from 2035.
ICNZ chief executive Kris Faafoi said: “Reducing risk is key to ensuring insurance remains accessible to Kiwi communities.”
Brokers with clients in the affected regions should ensure any damage from this event is lodged separately from older weather claims, confirm motor and property files are tied to this specific event, and review coverage adequacy for clients in Westland, Canterbury, and Otago.
