熱 帯 夜(ねったいや)

ねったいや

noun

tropical night (above 25°C)

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.

WORD FORMATION:
熱帯(ねったい) (tropical) + 夜(や) (night)

DEFINITION:
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.

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

RELATED TERMS:

真夏日(まなつび): hot summer day (over 30°C)
猛暑日(もうしょび): extremely hot day (over 35°C)
熱中症(ねっちゅうしょう): heatstroke

general

Added 2026.2.5 21:58

10000/10187_nettaiya