こくしょび 酷暑日 LinksSentence search for 酷暑日Sentence search for こくしょびKanji details for 酷, 暑 and 日Edit in JMdict Noun1. day on which the temperature rises above 35°C; extremely hot dayColloquial, See also 猛暑日Noun2. day on which the temperature rises above 40°Cused by the Japanese Weather Association Discussions Log in to talk about this word.