5–7of 31 days
May
Rarely- Sea
- 19°C
- Visitors
- 63%
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20 summers measured, 2006 to 2025
Kos weather, month by month
Wind, sea and visitors from May to October, as they really were.
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- Windiest stretch
- 26 June – 23 July
- Warmest sea
- 25°C in August
- Busiest month
- August
Windy days reaching 5 Beaufort
May to October, at a glance
7–12of 30 days
June
Sometimes- Sea
- 22°C
- Visitors
- 85%
Windiest
13–17of 31 days
July
Often- Sea
- 23°C
- Visitors
- 97%
Warmest seaBusiest
7–14of 31 days
August
Sometimes- Sea
- 25°C
- Visitors
- 100%
7–11of 30 days
September
Sometimes- Sea
- 25°C
- Visitors
- 81%
6of 31 days
October
Rarely- Sea
- 23°C
- Visitors
- 47%
Each bar is one summer, 2006 to 2025, and the red one is the windiest. A windy day is one that reached 5 Beaufort or more at some point between 10:00 and 20:00. Where you see two figures, one comes from our 20-summer record for the whole island and the other from the anemometer at the airport. Visitors are compared with the August peak.
No two alike
Twenty summers, one row each
Each row is a summer, each square a week. Darker means more windy days. No two summers match, so the cards above are a typical picture and your week can differ.
17 daysAugust 2012, the windiest
0 daysAugust 2018, the calmest
Check your own dates
Sheltered when it blows
During the windiest stretch, the most sheltered side was the south coast, with beaches fit for a swim such as Daidalos, Tropical and Chelona.
Is it windy, month by month
Is Kos windy in May?
Rarely: 5 to 7 of the 31 days reached 5 Beaufort or more, averaged over the last 20 summers. Our record gives 5, the airport anemometer 7. It swings a lot from year to year: 1 days in 2012, 9 in 2020. The sea averages 19°C, and visitors reach 63% of the August peak.
Is Kos windy in June?
Sometimes: 7 to 12 of the 30 days reached 5 Beaufort or more, averaged over the last 20 summers. Our record gives 7, the airport anemometer 12. It swings a lot from year to year: 0 days in 2018, 11 in 2025. The sea averages 22°C, and visitors reach 85% of the August peak.
Is Kos windy in July?
Often: 13 to 17 of the 31 days reached 5 Beaufort or more, averaged over the last 20 summers. Our record gives 13, the airport anemometer 17. July is the windiest of these months. Almost all of it comes from the north: the meltemi. It swings a lot from year to year: 7 days in 2011, 21 in 2022. The sea averages 23°C, and visitors reach 97% of the August peak.
Is Kos windy in August?
Sometimes: 7 to 14 of the 31 days reached 5 Beaufort or more, averaged over the last 20 summers. Our record gives 7, the airport anemometer 14. It swings a lot from year to year: 0 days in 2018, 17 in 2012. The sea averages 25°C, the warmest of these months, and August is the busiest month.
Is Kos windy in September?
Sometimes: 7 to 11 of the 30 days reached 5 Beaufort or more, averaged over the last 20 summers. Our record gives 7, the airport anemometer 11. It swings a lot from year to year: 2 days in 2015, 13 in 2021. The sea averages 25°C, and visitors reach 81% of the August peak.
Is Kos windy in October?
Rarely: 6 of the 31 days reached 5 Beaufort or more, averaged over the last 20 summers. It swings a lot from year to year: 2 days in 2019, 14 in 2010. The sea averages 23°C, and visitors reach 47% of the August peak.
How these numbers were measured
A windy day is one that reached 5 Beaufort or more at some point between 10:00 and 20:00. The record comes from ERA5, the European weather archive run by Copernicus, and covers 2006 to 2025. The second figure comes from the METAR reports of Kos airport over the same years. An airport is one spot, so neither number alone is the whole island. Sea temperature comes from Copernicus satellite records, 1995 to 2024, about 5 km offshore, so shallow bays run warmer. Visitor figures are official overnight stays for 2024 and 2025, so they leave out day trippers and cruise passengers. These are typical values, not a forecast for any single day.
Other places, same measurements
Typical values, not a forecast. Wind: ERA5, Copernicus, 2006 to 2025, plus the METAR records of Kos airport. Sea: Copernicus, 1995 to 2024. Visitors: official overnight stays, 2024 to 2025.