YOU SAID:

yep i was a cool night to come to my school

INTO JAPANESE

うん、学校に来るのは涼しい夜だった

BACK INTO ENGLISH

Yeah, it was a cool night to come to school

INTO JAPANESE

ええ、学校に来るのは涼しい夜でした

BACK INTO ENGLISH

Yeah, it was a cool night to come to school