Avg weather in September
12 Hrs per day
11 mm per month
67 % avg
12 Mph avg


What’s the weather like in Kos in September?

Kos sits off the southwest coast of Turkey in the Aegean Sea. This gives the Dodecanese island typical Mediterranean weather with long, hot summers and mild, wet winters. You’ll get lots of sun and not much rain if you’re going in September, and the island’s relatively flat meaning there aren’t huge differences in weather across regions. There’s a mountainous area that protects the south from winds and rain, and you’ll be kept cool by the sea and breezes on the coast.


The average high in Kos during September is 28ºC which is perfect for lounging by the pool or on the beach. Evenings stay quite warm at 19ºC so you won’t need many warmer clothes. The sea temperature is 24ºC, while humidity’s moderate. There’s usually 17mm of rain over five days, and you can expect 12 hours of daylight with 11 hours of sunshine each day. UV levels will be high so make sure you take sun cream. Sunset’s around 7.40pm at the start of the month and gradually gets earlier.

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