We are regular visitors early oct and generally find the days nice and warm,but you will need a light cardigan/sweater for the evenings by then quite a few of the restaurants have their false walls back in place so they are enclosed.
Hi Jimbo, welcome to the forum. This will be our third year going out in early October, as other posts have said very nice temperatures during the day, but take a light jacket for evenings. We were there last year and to be honest I hardly ever used my cardigan, maybe that's because the alcohol kept me warm haha.
Hi i've been in Antalya at christmas walked around in a T shirt . Alanya is the same Fethiye was cold and wet in Nov but alanya was warm and sunny . its milder in this area in the winter and no problem in Oct . Diane