How do you say "a brutally hot day, forty degrees and up" in Japanese?

Name: Japan Just Made a New Word for Hot Official. It Starts at Forty Degrees.
Uploaded: 2026-08-22T02:19:32Z
Duration: 27 s
Description: Learn to say 酷暑日 (kokushobi) — a brutally hot day, forty degrees and up. A 30-second Japanese lesson for travelers from Kōfuku.

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Japan Just Made a New Word for Hot Official. It Starts at Forty Degrees.

To say a brutally hot day, forty degrees and up in Japanese, say 酷暑日 (kokushobi).

Your app says thirty five and locals shrug. It says forty and Japan pulls out a different word.

酷暑日 kokushobi a brutally hot day, forty degrees and up

Survival sign-decode #learnjapanese #japantravel #japansummer #japantips #survivaljapanese

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In this video

明日は酷暑日です。 ashita wa kokushobi desu. Tomorrow is a brutally hot day.
酷暑日は無理をしないでください。 kokushobi wa muri o shinaide kudasai. On a forty degree day, don't push yourself.

Kanji in this phrase

酷暑日: こくしょび
猛暑日: もうしょび

Why this phrase

Japanese forecasts grade heat by word, not just number, and as of this summer the top grade is 酷暑日, a day of forty degrees or more. The weather agency made it an official forecast term in April 2026 after a public vote, and it shows up on phone alerts, station posters and TV forecasts on the days it hits. One takeaway: see 酷暑日 and move your plans indoors.