Kos weather

Our guide to the weather in Kos during September

27

Average high

6

UV Index

17mm

Monthly rainfall

25

Sea temperature

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.

Holidays in Kos

Holiday deals you might be interested in

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£398pp | Last-minute 5* all-inc Kos holiday with flights - save up to 35%

Enjoy a week at the popular 5* Mitsis Ramira Beach in Kos at the end of the month and you can snap it up on an all-inclusive board basis for UNDER £400pp with return flights and SAVE up to 35% off the regular rate!

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Save 30%

£486pp | 5* luxury all-inc Kos week at lush Mitsis resort w/flights

Head to Kos in April and enjoy an all-inclusive week at the 5* Mitsis Summer Palace with return flights when you book this banger from Bluesea Holidays.

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£650pp | 5* luxury last-minute all-inc Kos holiday with flights

Enjoy this luxury 5-star Greek Island ALL-INCLUSIVE week with 10 pools & private beach in Kos. The hotel boasts sea-view rooms, 10 restaurants, 6 bars, and a Turkish bath!

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£475pp | All-inclusive 5* luxury Mitsis holiday in Kos with flights

Check out this all-inclusive Kos holiday at the very end of April! The deal includes meals, drinks, snacks and accommodation at a highly-rated 5* Mitsis resort with return flights! In peak summer, this holiday can cost over £1600 per person!

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Kos: Half board getaway with beguiling Aegean Sea views

£424pp

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Kos: All inclusive getaway near the Aegean Sea

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Kos: Tranquil escape focused on well-being and relaxation

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Kos: Deluxe all-inclusive week with luggage, flights & transfers

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7-nights • October

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Kos: deluxe all-inc+ week w/luggage, flights & transfers (save an extra £50pp)

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Kos: luxury 5* half-board break w/jnr suite & private whirlpool inc. luggage, flights & transfers

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Kos: Ultra-luxury all-inc getaway

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UNDER £500 | All-inclusive 5-star Kos getaway with flights - day before over 70% more!

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Kos Blog posts

From the UK's most popular travel bloggers

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Discovering Greece by Yacht: Four Islands to Visit

27th October 2023 by Conversant Traveller

Greece, with its impressive collection of approximately 6,000 islands, is an ideal destination for those looking to embark on a boat exploration. Its vast territory spans across the Aegean and Mediterranean seas, offering a plethora of options for intrepid travellers. In this article, we will delve into four captivating islands that are well worth a visit during your yacht adventure in Greece....

Weather in Kos

Our month-by-month guide to the weather and climate in Kos

13.7

Kos weather in

January
14.6

Kos weather in

February
15.5

Kos weather in

March
18.2

Kos weather in

April
21.9

Kos weather in

May
25.6

Kos weather in

June
28.5

Kos weather in

July
28.9

Kos weather in

August
26.6

Kos weather in

September
22.9

Kos weather in

October
19.4

Kos weather in

November
15.7

Kos weather in

December