YOU SAID:

It is a mighty fine day, is it not?

INTO JAPANESE

とてもいい天気ですね。

BACK INTO ENGLISH

It's such a nice weather.

INTO JAPANESE

とてもいい天気です。

BACK INTO ENGLISH

The weather is very nice.

INTO JAPANESE

天気はとてもいいです。

BACK INTO ENGLISH

The weather is very nice.