夏日
な
つ
び
Meanings
1
hot summer day
General term for a day that feels hot in summer, without a strict temperature definition.
Today is a hot summer day; stepping outside makes you sweat.
2
day with max temp ≥ 25°C
Meteorological definition: a day when the highest temperature reaches 25°C or above. Compare with 真夏日 (≥30°C) and 猛暑日 (≥35°C).
This year, the first day with a high of 25°C came earlier than usual, exceeding 25°C in April.
Usage patterns
- 〈場所〉で夏日になるto become a hot summer day (in a place)
Today Tokyo had its first hot summer day of the year.
- 夏日が続くfor hot summer days to continue in a row
Hot summer days have continued since last week, and I feel sluggish.
- 夏日を記録するto record/mark a day as a hot summer day
That region recorded a hot summer day even though it was March.