My temperature is at 38.4° =[体温](https://eikaiwa.dmm.com/uknow/questions/42562/)が38.4°だ
I have a fever of 38.4°=38.4°の[熱がある](https://eikaiwa.dmm.com/uknow/questions/3705/)
体温が、と言うよりかは熱がある事をアピールしたいのであれば下の回答をお勧めします。
因みにアメリカ人は摂氏ではなく華氏を使いますので、38.4°でしたら101.2°と伝えましょう。
My temperature is 38.4 degrees, I have a slight fever.
I have a fever of 38.4 degrees.
When someone's temperature is 38.4 degrees, it means they have a slight temperature and are probably feeling a bit unwell.
When people have a fever they often feel too hot, or too cold, they may have a virus such as a cold, or the flu.
It is important that they look after themselves when they have this temperature.
You can also simply mention that you are not feeling very well. When our body temperature is high, we call it a fever. You can say "I took my temperature and I have a slight fever. My temperature is at 38.4". Also, if someone is experiencing a fever, when you touch their forehead, you can say “You are burning up!” This indicates that there is a very high fever or a slight fever.
シンプルに：
"I'm not feeling very well"（具合が悪い）
と言うこともできます。
「発熱」は「fever」と言います。
例えば：
"I took my temperature and I have a slight fever. My temperature is at 38.4".
（体温をはかったら、微熱があります。38.4度です）
また、熱がある人のおでこに手を当てて：
"You are burning up!"（熱いよ！）
高熱、微熱のときに使います。
1) I have a 38.4 degrees fever.
(私が38.4度の熱があります。)
一番シンプルで、伝わりやすい表現方法です。
2) My temperature is 38.4 celsius.
（私の熱は摂氏38.4度です。）
”Temperature”は「温度」という意味の単語としても使われますが、〇〇(名詞)+"Temperature is"で「〇〇の熱は〜」という意味になります。
また、アメリカなどの国では、温度の単位は摂氏(℃)"celcius"ではなく華氏(°F)"farenheit"が使われています。”celcius”と温度の後につけることで、よりわかりやすい説明となるでしょう。
" I have a slight fever of 38.4 degrees" is used when you are beginning to get a fever. The normal body temperature is of 36.8 degrees celcius. A a temperature slightly above normal to 38 degrees is considered a low grade fever. Therefore if your temperature is in that range you can say the sentence above. Anything more than that is considered dangerous and needs medical attention.
"I have a slight fever of 38.4 degrees"
熱が出始めた時に使う表現です。人の平熱は36.8度です。そこより少し高いところから38度までが「low grade fever (微熱)」とされています。その範囲に収まる場合上記の言い方ができます。その範囲を超える熱が出ると危険と考えられていて、治療が必要になります。
Your normal body temperature is about 37 degrees. Since it now 38.4, its slightly higher than usual, which shows that your fever is in its initial stages. Depending on what is the cause of your fever, you may experience a "cold sweat" or extreme warmth. In any case, this is a good indicator that you are not feeling well.
It could just be me, but usually I’d just say that I have a fever and leave it at that.
If you want to be more specific, you can say:
I have a 38.4 fever. / I have about a 101 degree fever. (Fahrenheit)
If you fever has steadily gotten worse, you can say:
My fever has risen to 38.4 degrees.
My fever has gotten higher. It’s 38.4 degrees.
You would like to explain that your fever is 38.4 degrees. In this case, you can speak in terms of 'having a temperature' - so: ''I have a temperature' or
'I've got a temperature.'
Negatives:'I don't have a temperature.'
'I haven't got a temperature.'
Here are two different ways to structure this sentence with either the fever being the object of the sentence. Where it's positioned doesn't change the meaning of the sentence but to tag adjectives to the end of a noun rather than in the front, we must use the preposition, "of."
I had a temperature spike of 38.4 degrees celcius.
I had an elevated temperature of 38.4 degrees celcius.
1. I had a temperature spike of 38.4 degrees celcius.
If your temperature spikes then it means that it increases
abruptly or sharply. If an adult has a very high fever of 39
degrees or more, then you should consult a doctor.
2. I had an elevated temperature of 38.4 degrees celcius.
The word elevated means raised or increased. A normal
body temperature is about 37.5 degrees celcius. As soon as it goes
beyond this, it is called an elevated body temperature.
If you would like to know how you can express to someone that you have a fever of a certain degree, you can say something like "My fever is at 38.4 degrees celsius." or "I have a fever of 38.4 degrees celsius.". This is a great way to express this to someone.
I have a high fever, it is running at 38.4 degrees.
A fever is when you have a very high body temperature, other symptoms can include having a headache, sweating, shivering. If you a suffering from a high fever you should seek medical assistance immediately.
アメリカ合衆国 
イギリス 
日本 
南アフリカ 
ニュージーランド 
