# Heavy rainfall and flooding in Japan

> Live situation record from CLSTR: https://clstr.news/situations/20260829-heavy-rainfall-and-flooding-in-japan
> Updated: 2026-08-29T22:38:29.000Z. Sources: 9. Developments: 2.

In mid-August, meteorological observatories in Japan issued warnings for heavy rain, landslides, and flooding in the Akita and Tochigi prefectures. Forecasts for these regions indicated potential hourly precipitation of 40mm and 24-hour totals reaching up to 100mm.

By late August, heavy rainfall in the Hokuriku region resulted in widespread damage, including landslides and flooding across six prefectures. The Fire and Disaster Management Agency reported that five people were injured and 917 houses sustained damage. Toyama Prefecture saw significant destruction, while Ishikawa and Fukui prefectures experienced extensive residential flooding. In Fukui, authorities issued a Level 5 heavy rain emergency warning for several cities and monitored the Ryugahana Dam for potential emergency water releases. Landslides also caused the closure of several major roads, including National Routes 158 and 364.

## Claims

- Five people were injured due to heavy rains in the Hokuriku region. (disputed)
- In Ishikawa Prefecture, 120 houses experienced above-floor flooding and 60 experienced below-floor flooding. (disputed)
- In Fukui Prefecture, 14 houses experienced above-floor flooding and 80 experienced below-floor flooding. (disputed)
- Five people were injured across six prefectures due to heavy rains in the Hokuriku region. (disputed)
- Nineteen rivers in Fukui Prefecture overflowed due to record rainfall. (corroborated by 4 sources)
- A Level 5 heavy rain emergency warning was issued for Fukui City, Ono City, and Katsuyama City. (corroborated by 2 sources)
- Katsuyama City recorded 376.5 mm of rainfall between August 28 and August 30. (corroborated by 2 sources)
- Fukui Airport is currently unusable due to flooding around the runway. (corroborated by 2 sources)
- Two people were injured in Fukui Prefecture, including a woman who fell into a ditch in Sakai City. (corroborated by 2 sources)
- National Route 417 between Kawachi and Tashiro is closed due to heavy rain. (single source)
- A total of 917 houses suffered damage, including total destruction and flooding. (single source)
- Toyama Prefecture experienced the most significant damage, with 1 house totally destroyed, 6 partially destroyed, 185 flooded above floor level, and 431 flooded below floor level. (single source)

## Timeline

### 2026-08-29: Hokuriku region heavy rains cause widespread flooding and injuries

Heavy rains in Japan's Hokuriku region have injured five people and damaged 917 homes. Toyama, Ishikawa, and Fukui prefectures face significant flooding, landslides, and road closures.

9 sources. https://clstr.news/cluster/japan-heatwave-extreme-temperatures-forecast-for-tokai-and-kinki-regions

### 2026-08-18: Heavy rain and landslide warnings issued for Akita and Tochigi prefectures

Heavy rain, landslide, and flooding warnings have been issued for Akita and Tochigi prefectures in Japan, with significant rainfall and thunderstorms expected through August 21.

4 sources. https://clstr.news/cluster/heavy-rain-and-landslide-warnings-issued-for-akita-and-tochigi-prefectures

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Cite as: Heavy rainfall and flooding in Japan. CLSTR, https://clstr.news/situations/20260829-heavy-rainfall-and-flooding-in-japan