YOU SAID:

It was a hot sunny day and I felt really tired

INTO JAPANESE

とても暑い日でしたので、とても疲れました

BACK INTO ENGLISH

It was a very hot day, so I was very tired.

INTO JAPANESE

とても暑い日だったので、とても疲れました。

BACK INTO ENGLISH

It was a very hot day, so I was very tired.