真夏日(まなつび)

まなつび
noun
hot summer day (30°C or higher)
weathertime-general
1. hot summer day
A day when the maximum temperature reaches 30°C (86°F) or higher. An official meteorological term used by the Japan Meteorological Agency.
今日(きょう)は真夏日(まなつび)になる予報(よほう)だ。
Today is forecast to be a hot summer day.
真夏日(まなつび)が続(つづ)いている。
The hot summer days continue.
今年(ことし)の真夏日(まなつび)の日数(にっすう)は過去最多(かこさいた)を記録(きろく)した。
This year recorded the highest number of hot summer days in history.

An official meteorological term used by the Japan Meteorological Agency (気象庁(きしょうちょう)) to classify days when the maximum temperature reaches 30°C or higher.

Etymology

真夏(まなつ) (midsummer) + 日(び) (day)

Types

The Japan Meteorological Agency's categories for hot days:

Usage

Commonly appears in weather forecasts and news reports, especially during summer months. The number of 真夏日(まなつび) per year is tracked as a climate indicator.

Related words

Related Words

Related: 猛暑日(もうしょび) (extremely hot day (over 35°C))
Related: 熱帯夜(ねったいや) (tropical night (over 25°C))
Related: 猛暑(もうしょ) (extreme heat)
Related: 酷暑(こくしょ) (intense heat)
Compare: 最高気温(さいこうきおん) (highest temperature)
general
Added 2026.2.5 21:58 · Revised 2026.10.19 9:42
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