Such is an adverb that can modify an article or an adjective.
'Such' means.....so, or very.
If the word requires an article, it also requires an article when you use such.
If the word doesn't require an article, it doesn't require an article with such.
It is wonderful weather.........It is such wonderful weather.
It is a nice day.......................It is such a nice day.
She is a beauty........She is such a beauty!