YOU SAID:
Today is a very nice day.
INTO JAPANESE
今日はとても素敵な日です。
BACK INTO ENGLISH
It is a very nice day today.
INTO JAPANESE
今日はとてもいい天気です。
BACK INTO ENGLISH
It's very nice weather today.
INTO JAPANESE
今日はとてもよい天気です。
BACK INTO ENGLISH
Today is a very good weather.
INTO JAPANESE
今日はとても良い天気です。
BACK INTO ENGLISH
Today is a nice day.
INTO JAPANESE
今日は素敵な日です。
BACK INTO ENGLISH
Today is a nice day.
That didn't even make that much sense in English.