Kythnos Weather

One of the lesser populated islands of the Cyclades, the pristine Kythnos has weather resembling most nearby islands, with very high summer temperatures, humidity, strong winds, and a lasting sun.

In brief, the summers of Kythnos are hot, with temperatures often surpassing 35°C/95°F under the summer sun. This means that the island is an excellent destination for guests from early May to late October.

Below, you can see the average temperatures in Kythnos by month. We have also gathered information regarding the weather by month.

Average High & Low Air Temperature (in °C/°F)

 

Discover the weather in Kythnos by month:
January | February | March | April | May | June | July | August | September | October | November | December

January in Kythnos is quite cold, with some temperatures reaching below the threshold of 5°C/41°F. There's a lot of humidity and strong winds.

The average temperature is 11.5°C/52.7°F (maximum 14°C/57.2°F | minimum 9°C/48.2°F)
On the coldest nights, the temperature may drop to -0.6°C/31°F.
On the warmest days, the temperature may reach 20°C/68°F.
The sunshine lasts approximately 6.7 hours.
Humidity reaches 68%, while the mean speed of the wind is around 24.5 kph (15.2 mph).
The mean sea temperature is about 15.6°C/60°F; hence, the waters are quite cold.

February keeps the island's temperature at a low level.

The average temperature is 13°C/55.4°F (maximum: 15°C/59°F | minimum 11°C/51.8°F).
On the coldest nights, the temperature may drop to 0°C/32°F.
On the warmest days, the temperature may reach 21.1°C/70°F.
The sunshine lasts approximately 7.7 hours.
Humidity reaches 70%, while the mean speed of the wind is around 24.6 kph (15.3 mph).
The mean sea temperature is about 15°C/59°F; hence, swimming is not recommended.

March is still a relatively cold month for Kythnos, with chilling sea waters and medium-to-high humidity levels.

The average temperature is 13.5°C/56.3°F (maximum 16°C/60.8°F | minimum 11°C/51.8°F).
On the coldest nights, the temperature may drop to 1.1°C/34°F.
On the warmest days, the temperature may reach 26.1°C/79°F.
The sunshine lasts approximately 8.7 hours.
Humidity reaches 67%, while the mean speed of the wind is around 22 kph (13.7 mph).
The mean sea temperature is about 15°C/59°F; hence, swimming is not recommended.

Kythnos gets warmer in April, while the sunlight hours also increase gradually.

The average temperature is 16.5°C/61.7°F (maximum 20°C/68°F | minimum 13°C/55.4°F).
On the coldest nights, the temperature may drop to 7.2°C/45°F.
On the warmest days, the temperature may reach 27.8°C/82°F.
The sunshine lasts approximately 10 hours.
Humidity reaches 65%, while the mean speed of the wind is around 18.7 kph (11.6 mph).
The mean sea temperature is about 16.1°C/61°F; hence, the waters are very cold.

May offers a good time for a quiet, early-season stay in Kythnos, where most businesses open up and hotel prices are usually at their lowest.

The average temperature is 20.5°C/68.9°F (maximum: 24°C/75.2°F | minimum: 17°C/62.6°F).
On the coldest nights, the temperature may drop to 12.8°C/55°F.
On the warmest days, the temperature may reach 33.9°C/93°F.
The sunshine lasts approximately 11 hours.
Humidity reaches 62%, while the mean speed of the wind is around 16.1 kph (10 mph).
The mean sea temperature is about 18.3°C/65°F; hence, the waters are a little chilly.

June is semi-hot, with few intense winds, lower humidity, and a mid-temperature sea.

The average temperature is 25°C/77°F (maximum 29°C/84.2°F | minimum 21°C/69.8°F).
On the coldest nights, the temperature may drop to 15.6°C/60°F.
On the warmest days, the temperature may reach 37.2°C/99°F.
The sunshine lasts approximately 12.5 hours.
Humidity reaches 54%, while the mean speed of the wind is around 15.9 kph (9.9 mph).
The mean sea temperature is 21.7°C/71°F; hence, the waters are a bit on the warm side.

July is the start of the peak summer season, with temperatures skyrocketing above 30°C/86°F very frequently.

The average temperature is 27.5°C/81.5°F (maximum 31°C/87.8°F | minimum 24°C/75.4°F).
On the coldest nights, the temperature may drop to 20.6°C/69°F.
On the warmest days, the temperature may reach 40.6°C/105°F.
The sunshine lasts approximately 12.3 hours.
Humidity reaches 50%, while the mean speed of the wind is around 20 kph (12.4 mph).
The mean sea temperature is 23.9°C/75°F; hence, the waters are quite warm.

August is best known for its hot, dry climate, accompanied by ideally warm sea waters. Given that the island is full throughout the summer, it is best that you pre-book your hotel and ferry tickets a few months beforehand!

The average temperature is 28°C/82.4°F (maximum 31°C/87.8°F | minimum 25°C/77°F).
On the coldest nights, the temperature may drop to 16.7°C/62°F.
On the warmest days, the temperature may reach 38.9°C/102°F.
The sunshine lasts approximately 11.7 hours.
Humidity reaches 53%, while the mean speed of the wind is around 21.1 kph (13.1 mph).
The mean sea temperature is 24.4°C/76°F; hence, the waters are very warm.

September is still hot with warm sea waters, lots of sunlight hours, and significantly fewer visitors than July and August.

The average temperature is 24.5°C/76.1°F (maximum 28°C/82.4°F | minimum 21°C/69.8°F).
On the coldest nights, the temperature may drop to 12.2°C/54°F.
On the warmest days, the temperature may reach 33.9°C/93°F.
The sunshine lasts approximately 10.7 hours.
Humidity reaches 59%, while the mean speed of the wind is around 20 kph (12.4 mph).
The mean sea temperature is 23.5°C/74.3°F; hence, the waters are warm.

October has fewer open accommodations and tourist facilities, though there are enough amenities for visitors and the island's weather is still fine.

The average temperature is 20.5°C/68.9°F (maximum 23°C/73.4°F | minimum 18°C/64.4°F).
On the coldest nights, the temperature may drop to 12.8°C/55°F.
On the warmest days, the temperature may reach 30.6°C/87°F.
The sunshine lasts approximately 9 hours.
Humidity reaches 66%, while the mean speed of the wind is around 21.4 kph (13.3 mph).
The mean sea temperature is 21.7°C/71°F; hence, the waters are a bit warm.

The month of November signals the end of the season, with low temperatures, chilling breezes, and rising humidity levels.

The average temperature is 17.5°C/63.5°F (maximum 20°C/68°F | minimum 15°C/59°F).
On the coldest nights, the temperature may drop to 6.1°C/43°F.
On the warmest days, the temperature may reach 26.7°C/80°F.
The sunshine lasts approximately 7.8 hours.
Humidity reaches 71%, while the mean speed of the wind is around 22.4 kph (13.9 mph).
The mean sea temperature is 18.9°C/66°F; hence, the waters are a bit cold.

Kythnos in December is quite cold with little sunshine and temperatures rarely exceed 15°C/59°F.

The average temperature is 13.5°C/56.3°F (maximum 16°C/60.8°F | minimum 11°C/51.8°F).
On the coldest nights, the temperature may drop to 2.8°C/37°F.
On the warmest days, the temperature may reach 21.1°C/70°F.
The sunshine lasts approximately 6.4 hours.
Humidity reaches 72%, while the mean speed of the wind is around 23.8 kph (14.8 mph).
The mean sea temperature is about 16.7°C/62°F; hence, the waters are quite cold.