Climate Insights for Kos

The climate in Kos is warm and mild. The average annual temperature is 19°C and approximately 628mm of precipitation falls per year. January is the wettest month, receiving around 164mm of rainfall. Kos is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to 12°C.

Kos sees moderate temperature variation throughout the year, ranging from 12°C to 26°C. The warmest month is August, when average highs reach 26°C and the mean temperature sits around 26°C. January is the coolest month, with minimum temperatures around 12°C and an average of 13°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.

Kos is a relatively dry area, receiving approximately 628mm of precipitation annually, which averages out to around 52mm per month. The wettest month is January, averaging 164mm of rainfall. December and November also tend to see above-average precipitation. The driest month is August, with just 0mm. That's 164mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Kos is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Kos, which began on June 21, 2026. Kos is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 26°C, while the coldest stretch bottoms out in January near 12°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Kos is during March, April, May, June, September, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 33mm per month. By contrast, August can be uncomfortably hot with highs reaching 26°C, while January is the coldest period with lows dropping to 12°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Kos based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.