YOU SAID:

isn't it a good weather

INTO JAPANESE

いい天気じゃないですか

BACK INTO ENGLISH

Is not it nice weather?

INTO JAPANESE

天気がいいじゃないですか。

BACK INTO ENGLISH

The weather is nice, is not it?

INTO JAPANESE

天気はいいですね。

BACK INTO ENGLISH

The weather is nice, is not it?