Nagoya Swamped: Record Rain Sparks Flood Chaos Just Before the Asian Games

On the night of September 8, 2026, the city of Nagoya – home to roughly 2.5 million people – was hit by a sudden, bone‑wet downpour that turned streets into rivers and left residents scrambling for higher ground.

The Japan Meteorological Agency (JMA) logged an astonishing 219.5 mm of rain in just 24 hours, ranking it as the third‑highest September daily total ever recorded at the city's observatory. Even more startling was the one‑hour burst: 101.5 mm fell in sixty minutes, a rate that prompted officials to issue a Level 5 special flood warning for the Shonai River, which snakes through Aichi and Gifu prefectures.

That warning wasn’t just paperwork. Water levels rose sharply, overwhelming drainage systems and flooding both the upper and lower floors of homes. In Nagoya alone, 25 houses were submerged above floor level, another 13 below, and two suffered partial damage. Across Aichi Prefecture the toll was double‑fold, with 45 homes each above and below ground water.

Authorities quickly moved to protect the public. Around 3,500 residents were ushered into emergency shelters, while the mayor, Ichiro Hirosawa, ordered temporary accommodation for roughly 400 athletes and staff slated to compete in the Asian Games – which were set to kick off just eleven days later, on September 19.

Transport ground to a halt. Buses and subways were suspended, and about 200 vehicles were stranded or immobilised on flooded roads. The chaos was captured in pictures of cars navigating waist‑deep water and pedestrians wading through what had become an impromptu canal.

Fortunately, the injury count remained low. Aichi’s official damage report, updated early on September 9, listed 23 people with minor injuries – 21 in Nagoya and two in the neighboring city of Kitanagoya. No fatalities were reported.

While the immediate danger receded, officials continued to monitor river levels and infrastructure strain. The JMA warned that the area remained at “extremely high” risk of further inundation, urging citizens to stay alert until the water receded fully.

For a city gearing up to host an international sporting spectacle, the floods were a stark reminder of how climate‑driven extremes can intrude on even the most meticulously planned events. Residents, officials, and athletes alike now hope the waters will cooperate, allowing the 2026 Asian Games to proceed without a repeat of Nature’s surprise performance.