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Japan Swelters Through Record 41.8°C as South Korea Logs Second-Hottest July

Authorities are issuing heatstroke alerts to protect vulnerable communities from record-breaking temperatures

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satellite image of japan at 0530 utc on august 5 2025
Higher temperatures increase evaporation, so that more water is stored in the atmosphere, in turn increasing the risk of heavy rainfall and flooding

Overview

  • Japan’s Isesaki in Gunma Prefecture set a new national high of 41.8°C on Aug. 5 after topping 41.6°C earlier that day, the Japan Meteorological Agency said.
  • South Korea recorded its second-hottest July on record with an average temperature of 27.1°C and 22 consecutive tropical nights, according to the Korea Meteorological Administration.
  • More than 53,000 people have been hospitalized for heatstroke in Japan this summer, prompting advisories to stay indoors and seek hydration, data from the Fire and Disaster Management Agency shows.
  • July rainfall fell to record lows in several rice-growing prefectures after the rainy season ended three weeks early, depleting reservoirs and intensifying drought stress on paddy fields.
  • The Japanese government has pledged emergency pest control and drought relief measures to safeguard rice yields threatened by extreme heat and low rainfall.