YOU SAID:

I’m feeling under the weather today

INTO JAPANESE

今日は天気の下で気分が悪い

BACK INTO ENGLISH

I feel sick in the weather today.

INTO JAPANESE

今日は天気が悪い。

BACK INTO ENGLISH

The weather is bad today.

INTO JAPANESE

今日はいい天気だ。

BACK INTO ENGLISH

It is fine today.

INTO JAPANESE

今日はいい天気だ。

BACK INTO ENGLISH

It is fine today.