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Japan temperatures soar over 40C, marking first 'cruelly hot day'

The term was introduced in April by the weather agency to describe days when temperatures reach 40C.

BBC WorldJuly 22nd, 2026 7:00 AM3 views2 min read
Japan temperatures soar over 40C, marking first 'cruelly hot day'

Japan has recorded its first “cruelly hot day,” with temperatures climbing above 40C, according to BBC World.

The phrase is a newly introduced weather term in Japan, created by the national weather agency in April to describe days when the thermometer reaches 40C. The reading marks a stark reminder of the intensity of this summer’s heat and the growing frequency with which extreme temperatures are being tracked in the country.

The BBC World report, based on a monitored public feed, said the milestone was reached as Japan experienced soaring temperatures across parts of the country. The agency’s new wording is intended to give a clear label to days of exceptional heat, separating them from less severe hot-weather classifications.

While the feed summary did not include further detail on the location of the reading or any wider impacts, the threshold itself is notable because 40C is considered an extreme level for daily temperatures and can pose serious health risks. The introduction of a dedicated term earlier this year suggests Japanese forecasters are trying to communicate the seriousness of these conditions more directly to the public.

Japan regularly faces periods of intense summer heat, but surpassing 40C is still an especially severe event. Such temperatures can strain power systems, affect transport and work routines, and increase the risk of heat-related illness, particularly among older people and those working outdoors.

The BBC World report did not provide additional figures in the summary, and no further details were included about forecasts or the duration of the heat. Even so, the first use of the new term highlights how official language is adapting to the realities of more extreme weather.

This article is based on a monitored public feed and attributes the report to BBC World.

Source: BBC World - https://www.bbc.co.uk/news/articles/cp3rz07grngo?at_medium=RSS&at_campaign=rss

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