YOU SAID:

there's a thirty percent chance it's already raining

INTO JAPANESE

すでに雨が降っている可能性が30％あります

BACK INTO ENGLISH

There is a 30% chance of being already raining

INTO JAPANESE

すでに雨が降っている可能性は30％です

BACK INTO ENGLISH

The possibility of rain already is 30%

INTO JAPANESE

すでに雨の可能性は30％

BACK INTO ENGLISH

Possibility of rain already 30%

INTO JAPANESE

雨の可能性はすでに30％

BACK INTO ENGLISH

Possibility of rain already 30%