Dictionary / Vocabulary / 今月中に
こんげつちゅうに · also こんげつじゅうに
by the end of this month; before the month is out; in the course of this month
今月中にウインドウズの次のバージョンが出る見込みはないと思う。
I think it's unlikely that the next version of Windows will come out before the end of this month.