Kos weather
Our guide to the weather in Kos during September
Kos is a beautiful Greek island with a variety of attractions and activities to enjoy, particularly in September when the weather is still warm and sunny. We've looked at the most up-to-date weather data for Kos, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Kos weather in September.
How warm is it in Kos during September?
The temperature is extremely stable in September with average highs of 27℃ and lows just 4℃ lower at 23℃. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.
Does it rain in Kos during September?
On average, in September you'll see rain on just one day in the month. In other words, you shouldn't see any of the wet stuff. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in Kos during September?
You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during September. With moderate humidity, any breeze will have a welcome cooling effect.
How warm is the sea in Kos during September?
The water around Kos reaches a very pleasant 25℃ during September. This is very warm, and will feel bath-like. People who normally feel the cold will find this temperature perfectly acceptable. The hot air temperature will mean that you will feel comfortably warm when coming out of the water.
Weather in Kos
Our month-by-month guide to the weather and climate in Kos
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