# Japan heatwave and heatstroke alerts

> Live situation record from CLSTR: https://clstr.news/situations/japan-heatwave-and-heatstroke-alerts
> Updated: 2026-08-03T10:02:14.000Z. Sources: 16. Developments: 2.

In late July 2026, meteorologists warned that Japan would face a prolonged heatwave with temperatures exceeding 40 °C in parts of Kyushu. The Japan Meteorological Agency and the Environment Ministry forecast a maximum of 40 °C in Kurume on August 3, and the wet‑bulb globe temperature was expected to reach 36 in Fukuoka, well above the danger threshold. Fukuoka Prefecture issued a prefecture‑wide heatstroke alert, urging residents to stay hydrated, avoid outdoor activity during peak heat, and use air‑conditioning. Emergency services in the Hiroshima region reported 13 heatstroke‑related hospital transports as temperatures rose to 38.3 °C in Akiota Town and 37.6 °C in Fuchu City, highlighting heightened risk for the elderly, children, and those with pre‑existing conditions.

By early August, the focus shifted as Typhoon 13 approached Fukushima, bringing unusually high waves of 3‑4 metres and prompting authorities to advise residents to stay away from the shoreline until at least 6 August. Despite cooler daytime temperatures around 23 °C in Fukushima City, officials warned of a “hidden heatstroke” danger, noting 75 emergency transports for suspected heat‑related illness earlier in the year. The risk was emphasized for the elderly, people in humid or indoor settings, and those resting at night, with continued advice on hydration and air‑conditioning use.

## Timeline

### 2026-08-03: Fukushima warns of dangerous high waves and hidden heatstroke risk as Typhoon 13 approaches

Fukushima warns of 3‑4 m high waves from Typhoon 13 and hidden heatstroke risk, with 75 emergency transports despite modest temperatures, urging caution for sea activities and vulnerable residents.

2 sources. https://clstr.news/cluster/fukushima-warns-of-dangerous-high-waves-and-hidden-heatstroke-risk-as-typhoon-13-approaches

### 2026-07-29: Japan heatwave sparks alerts and heatstroke emergencies

Japan faces a 40 °C heatwave; Fukuoka issues a heatstroke alert and 13 people are hospitalized in Hiroshima region after extreme temperatures.

16 sources. https://clstr.news/cluster/iu-sues-over-false-rumors-and-postpones-concert-due-to-ear-condition

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Cite as: Japan heatwave and heatstroke alerts. CLSTR, https://clstr.news/situations/japan-heatwave-and-heatstroke-alerts