Isesaki in Gunma Prefecture recorded 41.8°C (107.2°F) at 14:26 LT on August 5, 2025, setting Japan’s highest temperature on record and marking the second time in one week that the national record was broken.
Japan recorded its hottest June since records began in 1898, with average temperatures 2.34°C (4.21°F) above normal and over 200 locations registering highs of 35°C (95°F) or more, the Japan Meteorological Agency reported on June 30, 2025.
At least four elderly women died of suspected heatstroke on June 17, 2025, in Japan’s Kanagawa, Shizuoka, Saitama, and Gunma Prefectures. More than 60 monitoring stations recorded temperatures at or above 35 °C (95°F). Temperatures are expected to rise until June 20, and a heat advisory is in place.
Record-breaking temperatures were measured in Japan on Wednesday, March 26, 2025, with 143 stations either tying or breaking the record for the hottest March day on record.
The Japan Meteorological Agency issued extreme heat warnings on July 7, 2024, after parts of Japan broke record heat levels. On the same day, Shizuoka touched 40 °C (104 °F), marking its highest recorded temperature since records began in 1940. The heatwave has led to four deaths and over 2 000 hospitalizations.
Many heat records have been shattered in northern Japan with the start of the new week.
Record-breaking June temperatures are engulfing Japan, prompting authorities to issue heatstroke advisories and warn of power outages. High temperatures are expected to last at least until early July.
Unprecedented temperatures for the month of June hit western Japan on June 23 and 24, 2022, in the middle of the rainy season.
An unprecedented heatwave is sweeping over Hokkaido, Japan, with numerous all-time records falling almost every day. Very high temperatures are expected to continue over the next 14 days. One of the most notable records on July 27 was registered in Asahikawa, holder…
Heatwave conditions across Japan claimed lives of at least 57 people and sent 18 347 to hospitals from July 29 to August 4, 2019, the country's Disaster Management Agency said on Tuesday, August 6. This is more than triple the previous week's 5 664 and the…
