YOU SAID:
The weather is so lovely today.
INTO JAPANESE
今日は天気がとても素敵です。
BACK INTO ENGLISH
The weather is very nice 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.
That didn't even make that much sense in English.