It depends where you are going. We were in Turkey this year until 20th September and had a lovely time although things were still open it was noticeably quieter towards the end. I would say go a little earlier in September if you can.

hi malcom
there is still everywhere open and the weather is stil warm a bit cooler at night we usually go this time or later , just back last sat and it was 31oc lovely and warm .they were saying they were starting to close middle of oct and that was in altinkum . other bigger resorts might be later.
so book ond enjoy your hloiday ,myra

Everywhere is definitely still open in September. They only close down towards the end of October. Though the Antalya region is year-round, so things will still be open in winter in that area.

we are thinking of booking konakli i have never heard of it but the deal is very good reviews are not too bad either.

this is the antalya region so it's should be ok .ihave not been to this part but have to antalya and i enjoyed it there .