| | Extreme Temperature Diary- Saturday July 5th, 2025/Main Topic: Historic Heatwave Continues Across Japan and the Koreas – Guy On Climate
Dear Diary. The United States is in between major heatwaves. That doesn’t mean that all excess heat has relented across the Northern Hemisphere. Japan and the Koreas are stuck under a heat done that is hardly moving and won’t dissipate. Unlike its June 2025 American counterpart, the eastern Asian heat dine has and will last more than a week.
Here is the current 500 millibar pattern over Asia:
By the end of this week that heat dome is pretty much over the same place:
Here are some of the latest east Asian record temperature notes from Maximiliano Hererra:
Tweets by extremetemps
Here are more details from the Straits Times:
msn.com
‘Once-in-a-decade’ heatwave grips Japan, alerts issued after Tokyo breaches safe limits Malay Mail
TOKYO, July 6 — Japan is sweltering under an intense heatwave, with temperatures hitting the high 30s across much of the country today, prompting authorities to issue heatstroke alerts in 19 prefectures — including the first warnings this year for central Tokyo and neighbouring Kanagawa.
According to the Japan Meteorological Agency, the current heatwave is expected to persist until mid-July, marking a rare occurrence “seen only once in a decade.”
The agency attributes the extreme weather to climate change and a stronger-than-usual Pacific high-pressure system that has brought an unusually early end to the rainy season in western Japan.
The Japan Times reported today that temperatures climbed to 38.3C in Kuwana, Mie Prefecture, 37.9C in Toyota, Aichi Prefecture, and 37.7C in several cities including Tajimi in Gifu, Hamamatsu in Shizuoka, and Kofu in Yamanashi.
The Japan Sport Association advises cancelling outdoor sporting events if the heat index — which factors in temperature, humidity and solar radiation — exceeds 31.
In Tokyo, the index reached 32.2C by 11am, prompting the Japan Association of Athletics Federations to reschedule events during its three-day national championships at the Japan National Stadium in Shinjuku. Today’s adjustments followed similar delays on Friday and Saturday.
The early heat has been exacerbated by the premature conclusion of the rainy season in regions such as Chugoku, Shikoku, Kinki, and northern Kyushu, where the season ended nearly 20 days ahead of schedule — the earliest on record.
June was Japan’s hottest ever, with average temperatures 2.34C above the historical norm, the Meteorological Agency said. The trend is in line with rising global temperatures, as the agency warned that climate patterns are shifting due to global warming and changing wind systems.
Authorities are urging residents to take precautions against heatstroke, including staying hydrated, avoiding outdoor activity during peak hours, and seeking cooler indoor environments.
Here are more “ET’s” recorded from around the planet the last couple of days, their consequences, and some extreme temperature outlooks, as well as any extreme precipitation reports:
Jeff Berardelli: "Rainfall intensity has been trending upward near Austin. This shows the increase in hourly rainfall intensity. As the air warms it holds more moisture and has the potential to load storms with extra moisture and higher rain rates. GFX from @ClimateCentral" — Bluesky
Silicon Valley North - Citizens Climate Lobby: "Tragedy in Texas; Europe Heat Wave Continues; Carbon Burps; World Wide Droughts; Look Out So. Carolina; Weirder and Weirder Goes the Climate; Stopping Coastal Erosion. These stories and more on @climateguyw.bsky.social 's Extreme Temperature Diary today: guyonclimate.com/2025/07/05/e..." — Bluesky
Michael E. Mann: ""Extreme summer weather patterns have tripled since the 1950s" | Great piece in @upenn.edu's #PennToday on our recent @pnas.org article, providing critical context for the extreme heat we're seeing right now in North America and Europe: penntoday.upenn.edu/news/extreme..." — Bluesky
Dr. Aaron Thierry: "I'm starting a thread to keep track of what media coverage this "urgent message to world leaders" from #climate scientists receives. If you see anything, please add it to this thread ??" — Bluesky
Brad Johnson: "The entire website of the National Climate Assessments was taken down on July 1, 2025." — Bluesky
Bob Henson: "The latest from @drjeffmasters.bsky.social and me on Friday's horrific flash flooding in Texas (followed by yet another deadly flash flood in central TX on Sat AM). We also have an update on newborn and not-too-fierce Tropical Storm #Chantal. yaleclimateconnections.org/2025/07/deva..." — Bluesky
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