The holiday season will still be running, though places will start to be a bit quieter than in high season.
It will be a lot more chilled out and less people will be around. Though I am sure you will still be able to find some lively bars!
It should still be warm, though will get chilly in the evening and I would recommend a cardigan or light jacket. I was in Hanioti in the first week of October last year and whilst we had one day of rain and cloud it was mostly beautiful and hot enough to lie out all day. It should still be in the mid 70's at the very least.
I am sure that you will fall in love with Halkidiki, everyone I have ever talked to about it has!
Have a wonderful holiday!
