Following flooding and mudslides that lasted from late June through mid-July 2018 , an extensive heat wave spread across the Japanese mainland . In the prefectures that had been hit the worst by floods and landslides , Hiroshima , Okayama , and Ehime , 145 people were hospitalized with heat stroke symptoms as temperatures there rose above . On 15 July , 200 out of 927 stations in the nationwide observation network recorded maximum temperatures exceeding . On 23 July , a high temperature of was observed in Kumagaya , northwest of Tokyo . This constitutes an all-time high for all of Japan . Many cities recorded temperatures near on this day . In Kyoto , temperatures stood above for seven days in a row for the first time since records began to be kept in the 19th century . By 24 July , the Japan Meteorological Agency ( JMA ) called the event a natural disaster and indicated many areas were observing " unprecedented levels of heat "
flooding and mudslides
2018 Japan floods
2018 Northeast Asia heat wave