YOU SAID:

I think the weather will be super crappy when we will finally be on holidays .

INTO JAPANESE

私たちが最終的に休日になるとき、天気は非常に悪いと思います.

BACK INTO ENGLISH

When we finally go on holiday, I think the weather will be very bad.

INTO JAPANESE

いよいよ休暇に入ると、天気がとても悪くなると思います。

BACK INTO ENGLISH

I'm afraid the weather will be very bad when the holidays finally come.

INTO JAPANESE

連休が明けたら天気が悪くなるのではないかと心配しています。

BACK INTO ENGLISH

I'm worried that the weather will get worse after the holidays.

INTO JAPANESE

連休明けから天気が悪くなるのではないかと心配です。

BACK INTO ENGLISH

I'm worried that the weather will get worse after the holidays.