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In June 2025, Japan experienced record-breaking heat. According to the Japan Meteorological Agency, the nationwide average temperature for the month was +2.34°C higher than the normal value (the average from 1991 to 2020), marking the highest record for June since records began in 1898.*1 Particularly in northern Japan, the flow of the westerly winds was positioned further north than usual, resulting in warm air covering the region and persistent sunny weather. The amount of sunshine reached 143% of the normal level, indicating an exceptionally high level of sunlight.

The abnormal weather in June 2025 was not limited to Japan; reports of extreme climate events also came from various parts of Europe and Asia. In Europe, southern Spain experienced record-breaking heat with temperatures reaching 46°C, and France also faced consecutive days of extreme heat exceeding 40°C. These heatwaves led to widespread wildfires and an increase in the case of heatstroke across Europe.

In northern India and Pakistan, the ongoing heatwave since early June drove temperatures close to 50°C, exacerbating power shortages and water scarcity issues.  In southern China, particularly in Guizhou Province and Guangxi Zhuang Autonomous Region, torrential rains caused frequent flooding. As a result, tens of thousands of people were forced to evacuate their homes.

These phenomena are seen as consequences of ongoing global warming. United Nations Secretary-General António Guterres issued a warning in 2023, stating that "the era of global boiling has arrived "*2. This statement specifically indicates the critical situation that is now looming before us. It can be said that each of our individual choices will become increasingly important in the future.

*1･･･Data from the Japan Meteorological Agency

Japan Meteorological Agency | tables of Climatological Normals (1991–2020) (jma.go.jp)

*2･･･At the IPCC on July 27, 2023

Original text："The era of global warming has ended; the era of global boiling has arrived."