熱帯夜(ねったいや)

ねったいや
noun
tropical night (above 25°C)
weathertime-general
1. tropical night
A night when the minimum temperature does not fall below 25°C (77°F). An official meteorological term indicating uncomfortably warm nighttime temperatures.
昨夜(さくや)は熱帯夜(ねったいや)だった。
Last night was a tropical night.
熱帯夜(ねったいや)で眠(ねむ)れなかった。
I couldn't sleep because of the tropical night.
熱帯夜(ねったいや)が続(つづ)くと体調(たいちょう)を崩(くず)しやすい。
Consecutive tropical nights make it easy to get sick.

Etymology

熱帯(ねったい) (tropical) + 夜(や) (night)

Usage

A night where the lowest temperature stays at or above 25°C. Common during Japanese summers, especially in urban areas due to the heat island effect.

Cultural note

熱帯夜(ねったいや) can lead to sleep deprivation and heat-related illness. Air conditioning use is recommended.

Related words

Related Words

Related: 真夏日(まなつび) (hot summer day (over 30°C))
Related: 猛暑日(もうしょび) (extremely hot day (over 35°C))
Related: 熱中症(ねっちゅうしょう) (heatstroke)
general
Added 2026.2.5 21:58 · Revised 2026.10.7 15:55
10000/10187_nettaiya