The weather of Kythnos is quite pleasant, being warm and sunny for most periods of the year and not very cold, but pleasantly cool. Experiencing slightly strong winds on occasion, it would be best to check the weekly forecast before confirming your trip to Kythnos in summer, as these winds tend to make the extremely hot summer months quite bearable. The warm but pleasant weather generally occurs during May – June or even September – October. Offseason is during December – January. So make sure to plan your unforgettable trip to Kythnos according to the weather of your choice, be it warm sunshine, or cool breezes.