Kos sits in the Aegean Sea in the southern Dodecanese, offering a wide spread of site types: reefs, walls, drop-offs, drift dives, caves, wrecks, and an artificial reef. The depth range runs from the shallows to fifty metres, covering beginners through advanced divers. A stand-out geological feature is Therma Hot Springs, where volcanic hot spring water mixing with the sea creates intense thermoclines at very shallow depths. The wreck Thor Star provides an overhead environment with entanglement hazards. Water temperatures climb from the mid-teens in late winter to the mid-twenties in peak summer, making wetsuit choice important depending on season.
Monthly water temperature across Kos's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Temperatures are coolest from February through April, sitting in the upper teens Celsius, then warm steadily to reach their peak in August. From late spring through October conditions are most comfortable for recreational diving; a thicker suit is advisable outside those months.
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Water temperature around Kos ranges from about 17°C in February to 25°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 25°C) a 3mm full suit is comfortable in Kos; in the coldest months (about 17°C) step up to a 7mm or semi-dry suit.
Fin maps 9 sites in Kos (7 scuba diving sites and 4 snorkelling spots, with some suited to both).
Across Kos's dive sites, May, June and September are most often reported as the best months to visit.
5 more sites to explore
