YOU SAID:

I only went out when the weather was fine.

INTO JAPANESE

天気が良かったとき私は、出てを行った。

BACK INTO ENGLISH

When the weather is nice out I went.

INTO JAPANESE

天気がいいから行きました。

BACK INTO ENGLISH

I went from the good weather.

INTO JAPANESE

天気の良い日から行きました。

BACK INTO ENGLISH

I went from the good weather.