We went at beginning of May , the sun shone from morning to evening. but was'nt so hot that you could'nt get out and about.
The evenings were just right, a light top was all that was needed.
We had a great time, plenty of nice bar/coffee places, where you could sit and watch the world go by.
I'm sure in high season it would get quite busy.
ie : lots of clubs etc. but in general we found Kardamena
a great place to be.
The beach was not the best, but the sea more than made up for that.(crystal clear).
The locals were really great, very friendly and helpful. We loved every minute of our holiday.