# Extreme heat and weather alerts in Japan > Live situation record from CLSTR: https://clstr.news/situations/extreme-heat-and-weather-alerts-in-japan > Updated: 2026-08-25T11:30:00.000Z. Sources: 27. Developments: 2. Japan continues to face significant heatstroke risks and extreme temperatures. In Fukuoka Prefecture, authorities issued heatstroke alerts for late August, with temperatures in Kurume expected to reach 38 degrees Celsius and dangerous Wet Bulb Globe Temperature (WBGT) indices reported in Omata. To mitigate such risks, some local events, such as the Saga Castle Town Saka no Kuni Festival, have moved their schedules from August to May. Forecasts from the Japan Meteorological Agency indicate that high temperatures are likely to persist through November, driven by the El Niño phenomenon, which is expected to cause a slow progression of seasons. Recent updates confirm that high temperatures will likely persist through September and October, delaying the arrival of autumn. In addition to ongoing heatstroke alerts in Kumamoto and Tochigi Prefecture—where several locations have reached “dangerous” heat index levels—new weather threats are emerging. An autumn rain front is expected to move south toward Honshu, acting as a “rain cloud production line.” This front is predicted to bring heavy rain, particularly along the Sea of Japan coast, increasing the risk of river flooding and road inundation. Recent developments show the heat intensity escalating in Fukuoka, where temperatures in Hakata reached a record 40.4 degrees Celsius, marking the first time Fukuoka City has recorded a “scorching day” above 40 degrees. This heatwave has included a tenth consecutive day of extreme heat in the district, attributed to a high-pressure system and warm, humid air from a nearby typhoon. The public health impact has been severe; in July, over 41,000 people were hospitalized due to heatstroke, with at least 79 confirmed deaths. More than 60 percent of those hospitalized were aged 65 or older. Simultaneously, heavy rainfall and geological risks are intensifying. ## Claims - Temperatures in the Hakata district of Fukuoka reached 40.4 degrees Celsius. (corroborated by 7 sources) - Over 41,000 people were hospitalized across Japan for heatstroke in July. (corroborated by 4 sources) - At least 79 people died due to heatstroke in Japan during July. (corroborated by 4 sources) - A Level 5 heavy rain special warning was issued for parts of Ishikawa and Toyama Prefectures. (corroborated by 4 sources) - Unstable atmospheric conditions in the Sea of Japan may cause heavy rain, lightning, and tornadoes. (corroborated by 3 sources) - Three rivers in Ishikawa Prefecture have already flooded. (corroborated by 3 sources) - A Level 4 landslide disaster warning was issued for Tsubata Town in Ishikawa Prefecture. (corroborated by 2 sources) - The three-month forecast predicts high temperatures will continue through September, October, and November. (single source) - A heatstroke alert was issued for Kumamoto Prefecture with expected highs of 38 degrees Celsius. (single source) - A heatstroke alert was issued for Tochigi Prefecture, with several locations reaching 'dangerous' heat index levels. (single source) - A linear precipitation zone formed in western Toyama Prefecture on August 27, 2026. (single source) ## Timeline ### 2026-08-25: Japan faces extreme heat and heavy rain Japan faces extreme weather, with Fukuoka recording 40.4°C during a heatwave that caused over 41,000 hospitalizations in July. Meanwhile, heavy rains have triggered flooding and landslides in Ishikawa and Toya. 25 sources. https://clstr.news/cluster/japan-weather-forecast-predicts-prolonged-heat-through-november ### 2026-08-18: Japan regional news: Heatstroke alerts and local updates Regional news from Japan includes a heatstroke alert for Fukuoka Prefecture, the rescheduling of a Saga festival to avoid extreme heat, and local updates from Kyoto and Kitakyushu. 3 sources. https://clstr.news/cluster/typhoon-soudelor-forms-near-truk-islands-as-heatstroke-alerts-hit-japan --- Cite as: Extreme heat and weather alerts in Japan. CLSTR, https://clstr.news/situations/extreme-heat-and-weather-alerts-in-japan