This is from a native speaker gardener's youtube video where he tells about his roses Roses (see:5:50-5:53)
"This is September now and a lot of my roses are still blooming."
The structure "This is ...." sounded different to me, because when we talk about months, we say "It is (name of the month)" For instance, "It is September, June etc"
So, why does he say "This is September now." instead of "It is September now"?