YOU SAID:
Weather forecast: It is raining.
INTO JAPANESE
天気予報: 雨が降っています。
BACK INTO ENGLISH
Weather: it is raining.
INTO JAPANESE
今は雨が降っています。
BACK INTO ENGLISH
It is raining now.
INTO JAPANESE
今は雨が降っています。
BACK INTO ENGLISH
It is raining now.
That didn't even make that much sense in English.