How to Say "Body Temperature" in Japanese

体温

taion[ta̠iõ̞ɴ]

The Japanese phrase for "body temperature" is 体温 (taion).

体温 refers to the temperature of the body of a person or animal. If you want to specify basal body temperature, you can use the term 基礎体温.

Meaning: the temperature of the body of a person or animal (noun)

What does it mean word for word?

The word is composed of 体 (tai) meaning 'body' and 温 (on) meaning 'temperature' or 'warmth'.

For example, 体温が高い means "body temperature is high" and 体温が低い means "body temperature is low".

taion

If you want to convey that you have a fever, you can say Netsu ga arimasu.

In many Japanese households and schools, recording one's 体温 is often a formal, ritualized part of a daily health log rather than just a private observation.
The kanji 温 used in 体温 is also the first character in 温泉 (onsen), meaning 'hot spring'. This links the concept of biological warmth to the cultural tradition of geothermal bathing.
In Japan, tracking 基礎体温 (basal body temperature) is a widely recognized cultural practice for women to monitor reproductive health. This is often done using specific, colorful temperature charts that are a common household item.

基礎体温をつけています。
I'm keeping a record of basal body temperature.
This sentence is useful for demonstrating the use of 体温 in the context of recording basal body temperature.
Tatoeba #183529 by small_snow, translation #20652 by fishda
睡眠中は、体温が数度下がります。
When we sleep, our body temperature drops by several degrees.
This sentence shows how to describe the fluctuation of 体温 during sleep.
Tatoeba #11883219 by small_snow, translation #9943841 by ddnktr
子供は一般に大人よりも体温が高い。
Children generally have a higher body temperature than adults.
This sentence illustrates how to compare the 体温 of children and adults.
Tatoeba #2912415 by tommy_san, translation #3331682 by patgfisher
2 more sentences on Tatoeba

Yui is checking if Yota has a fever.

結衣 Yui

陽太くん、体温は高い？
Yota-kun, taion wa takai?
Yota, is your body temperature high?
陽太 Yota

うん、少し熱があるみたい。
Un, sukoshi netsu ga aru mitai.
Yeah, it seems like I have a bit of a fever.
結衣 Yui

体温計で測ってみる？
Taionkei de hakatte miru?
Do you want to try measuring it with a thermometer?
陽太 Yota

ありがとう、そうするよ。
Arigatou, sou suru yo.
Thanks, I will do that.

Sources

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