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In English, I just read it "one hundred degrees Celsius".  
In Japanese, I don't know how to read it.
CC BY-SA 3.0
2016-04-22T08:52:04.773
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2016-05-09T11:03:07.323
2016-05-09T11:03:07.323
question
pronunciation numbers symbols
How do I read 100°C in Japanese?
It is in a slightly different order in Japanese.

First comes Celsius, then the amount, and degrees at the end.

This would be one hundred degrees Celsius written out:

> 摂氏{せっし}100度{ど}

Fahrenheit for example would be similar

> 華氏{かし}100度{ど}

Most of the time saying Celsius is redundant though. If someone asks you what
is the temperature, you can just say 26 degrees.

> 気温{きおん}は何度{なんど}？
>
> 今{いま}、26度{ど}。
CC BY-SA 3.0
2016-04-22T09:10:23.843
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2016-04-22T09:45:29.543
2020-06-17T08:18:27.500
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answer
The reading depends on the situation. In a scientific or technical environment
Chris's answer is 100% correct.

However, in conversational non-technical situations it is read differently.

When speaking with someone you can say

```

    [度シー]{どしー}
    
```

for Celsius. However, in Japan the standard for expressing temperature is
metric, so there is no need to clarify that you are using the metric system.
Saying the number and [度]{ど} will suffice.

This can be proven a number of different ways.

First, if you have a Japanese IME on your computer or device and you
understand how to convert characters you can simply type in どしー into your
device and press the conversion button. You'll see that the IME will bring up
℃ as a conversion option (depending on the IME in use).

If you would like to refer to Fahrenheit in a conversational or casual
situation you can say

```

    [度エフ]{どえふ}
    
```

Here is a link [to a question on Yahoo Japan's Knowledege
Bag](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1453509879)
where a Japanese person is asking how to read ℃ and °F. The quote on reading
Celsius and Fahrenheit is listed and very roughly translated below.

[当然]{とうぜん}、[℃]{せっしど}も「[度]{ど}シー」というのと[同様]{どうよう}[°F]{かしど}も「[度]{ど}エフ」と[読]{よ}めば、[紛]{まぎ}らわしくありません  
Just as Celsius can be read as degrees C, reading Fahrenheit as degrees F will
naturally reduce ambiguity [between the two temperature systems].

On a side note, typing どえふ into your IME and converting it does not yield the
same result. From what I have seen, it doesn't look like °F has a unicode or
UTF-8 character. It is for this reason that if you highlight °F with your
mouse you will highlight two characters, but if you highlight ℃ with your
mouse you will only see one character highlighted.
CC BY-SA 3.0
2016-04-22T14:57:34.643
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2016-04-22T14:57:34.643
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answer
We say usually only 度 like 100度 because only Celsius is commonly used in
Japan, so we don't need to say 摂氏.
CC BY-SA 3.0
2016-04-22T15:36:30.650
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2016-04-22T15:36:30.650
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answer