Santorini’s weather in December and January are typically the wettest . The weather throughout autumn and winter is slightly more unpredictable than summer,Winter sees mean temperatures of about 10 ºC to 12 ºC
December and January, respectively, falling to 52mm come February. Humidity is at its highest during winter, averaging 74%. The water temperature drops to about 17 ºC during winter and Spring, before picking up to 22 ºC to 24 ºC in the summer months.