It's September 1st, so let's count:

1. pichlo, Jolla, "end of time off".
1 vote: panjgoori

2. robthebold, N9, "back to school".
1 vote: imaginaryenemy

3. mosen, Nexus 5, "quality time"
3 votes: saponga, tommo, chenliangchen

4. catbus, N9, "plan C"

5. www.rzr.online.fr, N9, no background story
4 votes: pichlo, mosen, robthebold, catbus

So catbus's vote is the tiebreaker, and it came in at 4:34 on 1 September, relative to US CDT, which is UTC-5, so 9:34 UTC on 01/09/2016 (unless I'm wrong, of course). Depending on location, it could still be August 31 at catbus's location. And honestly, I don't know how precise we want to be, or even when we define "end of month".

So I move that we accept catbus's vote and declare www.rzr.online.fr the winner this month. Anyone second that?