NHK warns of heatwave conditions across Japan as temperatures soar

Japan’s public broadcaster, NHK, has issued a weather advisory for 18 May 2026, forecasting sunny conditions and rising temperatures across the country. The broadcaster reported that the meteorological outlook indicates a significant increase in heat, with specific regions expected to meet the official criteria for heatwave days.

According to the report, parts of the Kinki and Kyushu regions are forecast to reach 35 degrees Celsius or higher. In Japan, a day is classified as a "heatwave day" (mōshobiyori) when the maximum temperature hits this 35-degree threshold. The forecast suggests that these areas will experience conditions consistent with this definition on the specified date.

NHK has advised the public to take immediate precautions against heatstroke in response to the rising temperatures. The broadcaster emphasised the importance of frequent hydration, urging residents to drink water regularly to mitigate health risks associated with the heat.

The advisory comes as part of ongoing public safety guidance during periods of high temperature. While the forecast predicts widespread sunny weather, the primary concern remains the potential for heat-related illness, particularly in regions where temperatures are expected to exceed the heatwave threshold.

Residents in the affected areas are encouraged to monitor the weather updates provided by NHK and adhere to the recommended safety measures. The broadcaster continues to provide regular updates on meteorological conditions and public health advice as the weather pattern develops.