noun
"major heat" solar term (approx. July 23)
One of the 24 solar terms (二十四節気). Marks the hottest period of the year in the traditional calendar, around late July.
See also: 二十四節気
大暑の頃は、毎年本当に暑くなる。
Around the time of 'major heat', it gets really hot every year.
noun
blistering heat; intense summer heat
General term for extreme summer heat. Often used in weather forecasts or descriptions of oppressive heat.
今日は大暑で、外に出るのがつらい。
Today's blistering heat makes it hard to go outside.
From 大 (great) + 暑 (heat). The solar-term sense derives from the traditional East Asian calendar.