Ios Weather

The weather of Ios is the typical Cycladic one, featuring mild winters with a few rainfalls, cool springs and autumns, and hot and shiny summers.

In brief, the weather in Ios is enjoyable during the tourist season (May to September) thanks to the sun. August is the hottest month.
We suggest visiting Ios in early June or September if you want to avoid crowds but still be able to engage in several activities as the weather allows it.

You will find the average temperatures and information about the weather by month below. 

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

 

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

January is the coldest month in Ios. The weather is windy and rainy on some days. The island's ambiance is very calm as most hotels and restaurants are closed.

The average temperature is 11°C/51.8°F (maximum 13.3°C/56°F | minimum 8.7°C/48°F)
The day lasts approximately 10 hours and there is sunshine for about 5 hours.
Humidity reaches 70% and the average sea temperature is 16°C/60.8°F.

February is similar to January in terms of weather. As aforementioned, winter is mild in Greece, with wind exacerbating the feeling of cold.

The average temperature is 11°C/52°F (maximum 13.5°C/56°F | minimum 8.7°C/48°F)
The day lasts approximately 11 hours and there is sunshine for about 6 hours.
Humidity reaches 71% and the average sea temperature is 15°C/59°F.

March, the first month of spring, is reminiscent of winter during its first days. However, after the first half of it, the weather starts to slowly change and the sun starts to appear a bit more and warm the island when it is apparent in the sky.

The average temperature is 13°C/55°F (maximum 15.5°C/60°F | minimum 10°C/50°F)
The day lasts approximately 12 hours and there is sunshine for about 7.5 hours.
Humidity reaches 71% and the average sea temperature is 15°C/59°F.

April is the month when the climate starts to feel warm, yet the sea is still cold and not appropriate for swimming. A few rainfalls may occur, too.

The average temperature is 16°C/60.5°F (maximum 19.3 °C/67°F | minimum 12.3°C/54°F)
The day lasts approximately 13 hours and there is sunshine for about 8.5 hours.
Humidity reaches 73% and the average sea temperature is 16°C/60.8°F.

In May, rainy and cloudy days gradually disappear; however, the weather remains quite windy. It is one of the best months to visit Ios if you want to pay less for a hotel and not encounter thousands of tourists. People with a tolerance for cold temperatures may want to swim in the sea, too.

The average temperature is 20°C/68°F (maximum 24.2°C/76°F | minimum 16°C/61°F)
The day lasts approximately 14 hours and there is sunshine for about 9.5 hours.
Humidity reaches 75% and the average sea temperature is 18°C/64.4°F.

Summer has officially arrived! June is an excellent month to be in Io, as the weather is warm and sunny. The sea temperature reaches an acceptable temperature for people to be able to swim in it and all establishments are open and ready to serve guests.

The average temperature is 24.5°C/76.2°F (maximum 28.7°C/84°F | minimum 20.4°C/69°F)
The day lasts approximately 14 hours and there is sunshine for about 11 hours.
Humidity reaches 76% and the average sea temperature is 21°C/69.8°F.

July is a sunny and hot month. Along with August, it is the busiest month of the year. If you plan on visiting Ios during July, we recommend booking your ferry tickets and staying a few months in advance, as thousands of visitors arrive on the island and last-minute availability comes with high prices.

The average temperature is 26.5°C/79.7°F (maximum 30.4°C/87°F | minimum 22.6°C/73°F)
The day lasts approximately 14 hours and there is sunshine for about 12 hours.
Humidity reaches 76% and the average sea temperature is 23°C/73.4°F.

Like July, August is a hot and sunny month. Winds called Meltemia blow during August and keep the island cool, especially during the night. As August is the second busiest month of the year, booking your ferry tickets and hotel a few months in advance is highly advised.

The average temperature is 26.6°C/79.9°F (maximum 30.2°C/86°F | minimum 23°C/73°F)
The day lasts approximately 13.5 hours and there is sunshine for about 11.5 hours.
Humidity reaches 77% and the average sea temperature is 24°C/75.2°F.

September is the first month of fall, but the first two weeks (if not the whole month - depending on the year) are more reminiscent of summer than autumn. The temperature of the sea is perfect for swimming as it has absorbed the warmth of sunlight during summer. The profile of the island during September is similar to June's.

The average temperature is 23.9°C/75°F (maximum 27.3°C/81°F | minimum 20.5°C/69°F)
The day lasts approximately 12 hours and there is sunshine for about 9.5 hours.
Humidity reaches 73% and the average sea temperature is 23°C/73.4°F.

In October, the climate starts to chill and the temperature starts to gradually fall. The weather is considered pleasant even if the days are cloudy, but it can also get rainy. Hotels and establishments start to close as the last tourists depart.

The average temperature is 20.2°C/68.3°F (maximum 23.1°C/74°F | minimum 17.2°C/63°F)
The day lasts approximately 11 hours and there is sunshine for about 7.5 hours.
Humidity reaches 72% and the average sea temperature is 21°C/69.8°F.

November can be labeled as the first cold month in Ios. Since it is the last month before the start of winter, the sky is cloudy and the days cool more and more as they pass

The average temperature is 16°C/60.8°F (maximum 18.5°C/65°F | minimum 13.4°C/56°F)
The day lasts approximately 10 hours and there is sunshine for about 6.5 hours.
Humidity reaches 72% and the average sea temperature is 19°C/66.2°F.

December, the first month of winter, is a cold month. The temperatures are low and the weather can be rainy. Entertainment and stay options are very limited during that month.

The average temperature is 12.5°C/54.5°F (maximum 14.7°C/58°F | minimum 10.3°C/51°F)
The day lasts approximately 9.5 hours and there is sunshine for about 6 hours.
Humidity reaches 70% and the average sea temperature is 17°C/62.6°F.