The 24 Solar Terms
처서
處暑
End of Heat · Autumn
In 2026: Sun, August 23
Solar terms shift by about a day from year to year; this date is for 2026 (Korea Astronomy and Space Science Institute).
What it means
The summer heat begins to fade.
Weather around this time
Cool breezes in the morning and evening.
What people say
처서가 지나면 모기 입이 비뚤어진다.“After Cheoseo, a mosquito's mouth goes crooked” — the bugs give up as it cools.
Frequently asked questions
What does Cheoseo (처서) mean?
Cheoseo (처서, 處暑) means “End of Heat”. The summer heat begins to fade.
When is Cheoseo in 2026?
In 2026, Cheoseo falls on Sunday, August 23. It's one of the six autumn terms, and the date shifts by about a day from year to year.
What is the weather like around Cheoseo?
Cool breezes in the morning and evening.
Is there a Korean saying about Cheoseo?
Yes: “처서가 지나면 모기 입이 비뚤어진다” — “After Cheoseo, a mosquito's mouth goes crooked” — the bugs give up as it cools.