Kalymnos is most commonly visited during the summer months as Greek nationals and tourists escape the mainland heat for the sea breezes. Still, the summer months of July and August can be quite warm with daily high temperatures ranging in the mid-thirties Celsius. Spring (May - June) and autumn (September - October) tend to be more comfortable but more variable in terms of daily temperatures. Towards the end of October, the colder winds come in from the north, bringing winter, and the temperature drops drastically. http://wikitravel.org/en/Kalymnos