Best time to visit Kos

The best time to visit Kos for a beach holiday is from mid-June through to mid-September.

For general outdoor activities anytime from early-May to mid-October, is good.

Kos weather

Located a short distance from the Turkish coast in the Eastern Aegean Sea, Kos has a Mediterranean climate of hot and sunny summers, and cold, wet winters. It's generally windy year-round.

Summer, from June to mid-September, is hot, dry and sunny. Sea breezes provide some relief to the intense summer heat of July and August.

The summer heat is tempered by a strong and persistent wind from the northwest, called the Meltemi.

Autumn, from mid-September to November, is initially warm and sunny, before becomming cooler, cloudy and wet.

Winter, from December to mid-March, is cold, partly cloudy and frequently wet, especially in December and January.

Spring, from mid-March to May, is mild, with rainfall gradually decreasing, and sunny days becoming more frequent.

What is the best month to visit Kos?
June through September are the best months to visit Kos – the climate is perfect with hot, sunny weather and little to no rainfall.

July and August are especially popular, since this is the peak tourist season in Kos.

To avoid the crowds, higher prices and extreme heat of summer, the months of May and October are also good for a range of outdoor activities.

Which is the hottest month in Kos?
The hottest month in Kos is normally August, with an average daily high temperature of 31°C (87°F), with high heat and humidity, and a low of 24°C (75°F).

However, on the warmest days of the month, the temperature usually reaches 35°C (95°F).

The hot season lasts from mid-June to mid-September, with an average daily high temperature above 28°C (82°F).

Which is the coldest month in Kos?
The coldest month in Kos is January, with an average high-temperature of 14°C (57°F) and an average low-temperature of 9°C (48°F).

The cool season lasts from December through March, with an average daily high temperature below 17°C (62°F).

Which is the sunniest month in Kos?
The sunniest month in Kos is usually July, with around 12 hours of bright sunshine per day – that's an average of 84% of daylight hours.

What is the humidity in Kos?
Kos experiences significant seasonal variation in perceived humidity, with approximate average relative humidity calculated at between 59% – 71% over the course of the year.

What do the humidity conditions feel like in Kos?
We derive the humidity comfort level – what conditions feel like – from the dew point temperature, which measures moisture content in the atmosphere: a higher dew point feels more humid, while a lower dew point feels drier.

Meteorologists agree that dew point temperature is a more consistant indication of 'absolute humidity' than relative humidity, which fluctuates with temperature.

The average annual dew point in Kos is 12°C (53°F), and varies over the course of the year from dry and comfortable at 6°C (42°F) to slightly humid at 19°C (66°F). 

The more humid time of year in Kos lasts from mid-June through to mid-October, when you can expect the comfort level to be muggy at least 15% of the time.

The month with the most muggy days in Kos is August, with around 16 days that are muggy.

November through April is generally comfortable, with no days in any month that are muggy.

When is the sea warmest in Kos?
The sea is usually at its warmest in Kos in August when the water temperature reaches 24°C (75°F), which is warm enough for swimming.

The sea is warm enough for swimming from July through September.

Which month has the most rain in Kos?
January is usually the wettest month in Kos, with 98mm (4in) of rainfall on average, distributed across 10 days.

The rainy season lasts from November to early-April, with a greater than 18% chance of a given day being a wet day. The heaviest rain in Kos falls during December and January.

The dry season lasts from early-April through October. The month with the least rainfall in Kos is July.

Which is the windiest month in Kos?
The windiest month of the year in Kos is February, with an average hourly wind speed of 24 kilometres per hour (15 mph; 13 knots).

The windy part of the year lasts from early-November to early-April, with average wind speeds of more than 20 kilometres per hour (12 mph; 11 knots).

The less-windy time of year lasts from early-April to early-November. The calmest month of the year in Kos is May, with an average hourly wind speed of 17 kilometres per hour (10.6 mph; 9 knots).

The predominant average hourly wind direction is from the north throughout the year in Kos.

Kos Weather Averages

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average high temperature (°C)
14 15 17 20 24 28 31 31 28 24 20 16
Average low temperature (°C)
9 10 11 13 17 21 23 24 21 18 14 11
Average daily sunshine (hrs)
4 5 6 8 9 11 12 11 9 7 5 4
Average daily daylight (hrs)
10 11 12 13 14 14 14 13 12 11 10 10
Comfort level – heat
ColdCold No heat No heat & humidity Low heat & humidity icon Moderate heat & humidity icon High heat & humidity icon High heat & humidity icon Moderate heat & humidity icon Low heat & humidity icon No heat & humidity No heat & humidity
Comfort level – humidity (#muggy days)
- - - - - 5 12 16 9 3 - -
Average dew point temperature (°C)
6 7 8 10 14 17 18 19 17 14 11 7
Average relative humidity (%)
70 71 68 66 66 64 59 62 65 68 70 70
UV Index (max)
2 3 5 6 8 10 10 9 7 5 3 2
Average days of rainfall (≥1mm)
10 9 7 4 2 1 - - 1 4 7 10
Average monthly rainfall (mm)
98 70 48 20 18 2 - - 8 26 48 81
Average wind speed (km/h)
20 21 19 17 15 17 19 19 17 17 18 20
Average sea temperature (°C)
16 16 16 17 19 22 23 24 24 22 19 17
Kos, Dodecanese, Greece

Holiday seasons

High season: June through August, when hotel and restaurant prices are high.

Low season: From March to May and September and October – the temperature is cooler, hotel prices are more reasonable and the crowds non-existent.

Source: Meteorological data for Kos is based on weather statistics gathered for the 30-year period 1991 to 2020 by the Hellenic National Meteorological Service (HNMS) from the nearest weather station: Kos Airport (KGS), located 21km (13mi) southwest of Kos Town.

Advice on the best time to visit a particular destination is based on average local weather statistics, when the weather conditions are generally better than at other times of the year. We consider high and low temperatures, risk of rain (and thunderstorms, etc.), amount of sunshine and sea temperature. For general outdoor activities we favour clear, rainless days with a temperature range between 18°C (64°F) and 27°C (80°F); and for hot-weather activities we favour clear, rainless days with a temperature range between 24°C (75°F) and 32°C (89°F). Often, the best times to visit correspond to high season and therefore involve higher prices.

More about Kos…

Latest update: Best time to visit Kos: 6 June, 2024

Disclaimer: The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data and conditions at any given location and time are unpredictable and variable. We assume no responsibility and can not be held legally responsible for any decisions made on the basis of the information presented on this site.