Hi Chris,
We go to
Icmeler around 3rd and 4th week of September, the weather is 35c, during the day, slightly cooler at night, which I think is great, (I don't like it too hot.) There may be the odd thunderstorm, but these don't last long and make spectacular viewing. As it nears the season end there may be bargains to be had. The holiday makers tend to be couples or older families as children hopefully are back at school, another reason to go at this time.
Reading from your previous posts I believe this is your first time to Icmeler possibly Turkey. Sit back and enjoy, we are asked "why go to the same place?" when you come back you will know why.
Enjoy Steve