Poem Sentence Structure

Grammatically it is not Chinglish.
Poetically, English (people) does not write sentence like this.

If you really want to say a beautiful day (depends on what you talk about).
e.g.
A beautiful day is just over the horizon.
A beautiful day is dawning.
A beautiful day is just around the corner.
未必全都合適的表達-要看你說的beautiful day所指coming轉變是跟那一種象徵形態相近。