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Japan Sets Record 41.8°C as East Asian Heatwave Escalates

Authorities issue heat warnings, deploy cooling centres, urge shelter in place, provide relief to drought-stressed farms.

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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 Meteorological Agency confirmed a new all-time high of 41.8°C in Isesaki on August 5, capping July as the hottest month since records began in 1898.
  • South Korea endured its second-hottest July on record at 27.1°C average and logged 22 consecutive tropical nights, the Korea Meteorological Administration reported.
  • More than 53,000 people have been hospitalized for heatstroke in Japan this summer, triggering alerts in 44 of 47 prefectures and the opening of emergency cooling centres.
  • July’s record low rainfall along the Sea of Japan coast has left key rice-growing prefectures critically dry, fueling pest outbreaks and threatening harvests.
  • Farm Minister Shinjiro Koizumi announced emergency pest control, drought relief measures and a new rice production policy to protect staple supplies.