Japan’s property catastrophe reinsurance market entered 2026 at its softest pricing in years. Then Typhoon Dujuan arrived – and the question for brokers shifted from how far rates could fall, to whether the coverage structures built during that softening are adequate for what the season is delivering.
Dujuan, Japan’s 25th typhoon of the year, struck the country’s Pacific coast on September 21 carrying sustained winds of 130 km/h and gusts of up to 194 km/h, according to BBC News. Almost two million people were placed under evacuation orders. Power was cut to more than 50,000 households. Hundreds of flights were cancelled, and rail services were suspended across multiple prefectures.
The storm arrived during a five-day national holiday, widening its economic footprint. Japan’s Prime Minister Sanae Takaichi reportedly delayed a scheduled trip to New York – where she was due to meet US President Donald Trump and address the United Nations General Assembly – to monitor conditions on the ground.
Read next: Insurers must brace for US$171 billion in annual cat losses, study finds
The Japan Meteorological Agency (JMA) initially issued warnings of an “imminent threat to life” across several prefectures. As of September 21, Level 4 landslide warnings remained active in Shinagawa Ward, Toshima Village, and Niijima Village, with a danger-to-life warning still in force in Oshima Town, BBC News reported.
The Yokosuka City Fire Department confirmed a woman in her 60s may have been swept away and buried alive after a landslide. In Chiba Prefecture, the Sodegaura City Fire Department said a man in his 50s was rescued after falling into a bamboo thicket with heavy machinery while clearing debris at a landslide site. He was taken to hospital.
Firefighters in Kanagawa Prefecture responded separately to a report of a house crushed by a landslide.
Full damage assessments were not expected before September 23. No preliminary insured loss estimates from catastrophe modellers had been issued as of press time.
The storm strikes at a point when Japanese property catastrophe programmes were priced for calm.
At the April 1, 2026, renewal – the main renewal season for Japan, Korea, and India – catastrophe excess-of-loss programmes in Japan saw risk-adjusted price reductions of up to 20%, with a point estimate of 16%, following another low-loss year, according to Howden Re’s April 2026 renewal report. Commissions on property surplus and earthquake quota share treaties also increased by 2 to 5 percentage points.
“Japan rates are now broadly back to early twenties levels. Strong reinsurer appetite, improving underlying performance, and a lack of major loss activity have all contributed to cedent-friendly outcomes at this renewal,” said Andy Souter, head of Asia Pacific at Howden Re.
According to the International Cooperative and Mutual Insurance Federation, which summarised Gallagher Re’s April 2026 1st View report, Japanese property catastrophe programmes achieved risk-adjusted rate decreases of between 15% and 17.5% following loss-free results. Aon’s April 2026 renewal report found that global reinsurance capital reached a record US$785 billion, with Japan among the Asia-Pacific markets securing double-digit rate reductions.
For brokers, the immediate concern is whether cedants used those conditions to strengthen programme structures – or simply to reduce spend.
Direct premiums written by General Insurance Association of Japan (GIAJ) member companies reached ¥10,344.2 billion in fiscal 2024, up 4.3%, largely driven by fire insurance.
The scale of that market sits alongside meaningful loss potential. Swiss Re Institute’s sigma 1/2025 report noted that primary perils – including tropical cyclones – hold the greatest potential for extreme loss years, with a 1-in-10 probability that global insured natural catastrophe losses could reach US$300 billion or more in a given year. Swiss Re also found that when events significantly exceed trend, reinsurers step in to cover more than half of excess losses – a dynamic that makes reinsurance programme design particularly consequential in active typhoon years.
For brokers advising clients on limits, the stakes of soft-market decisions come into sharper focus when a major storm is actively tracking the coast.
Read next: 2026’s calm cat year is luck, not a trend - Swiss Re
Dujuan is not an isolated event. The World Meteorological Organization’s (WMO) August 2026 update confirmed that El Niño is firmly established across the central-eastern equatorial Pacific, with a near 100% probability of persisting through February 2027 and forecast to reach very strong intensity before year-end.
Tokio Marine Research Institute noted in July 2026 that El Niño conditions tend to shift typhoon formation eastward, “allowing storms to intensify over warm ocean waters,” and that 2026 could see one of the most active typhoon seasons since 2015. Its analysis found that typhoon intensity increases under El Niño conditions relative to normal years – and rises further under Super El Niño conditions.
BBC News reported that climate research indicates storms forming in warming-ocean conditions are likely to become more intense on average, even without an increase in total typhoon frequency. Fewer storms, but stronger ones – that dynamic bears directly on how brokers should be framing attachment point and limits conversations with clients carrying Japanese property, event cancellation, or marine exposures.
With Dujuan still tracking north and the season far from over, the question for brokers is whether programmes placed in April were structured for the risk environment that 2026 has become.
