Kos, Greece experiences average highs of 21°C (70°F) and lows of 18°C (64°F) throughout the year. The climate is relatively dry, with only 6 rainy days per month on average. Sunshine is abundant, averaging about 11 hours per day. Average highs have stayed broadly stable across the available records.
Kos, Greece Weather & Climate 2026
Monthly climate averages for Kos, Greece. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: May–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
7.9/10
Best: May, June, August, September, October
UV Index
6
High
Temperature 21°C / 18°C
Feels Like 20°C / 16°C
Rainy Days 6
Rainfall 65 mm
Sunshine 11 h
Humidity 72%
Wind Speed 32 km/h
Dew Point 14°C
Hottest Month
27°C
August
Avg Low 25°C
Rain 0 days
Coldest Month
12°C
January
Avg High 15°C
Rain 14 days
Driest Month
0 days
July
Avg High 27°C
Avg Low 25°C
Windiest Month
36 km/h
January (Gusts 51)
Sea Temperature
18°C – 27°C
Warmest water: August (
26.9°C
)
Worst Time to Visit
Consider avoiding January, February due to frequent rain.
Sun Position
Sunrise 05:51
Daylight 14.7h
Sunset 20:32
Live conditions —
Kos on the map · live conditions
Kos, Greece
- Continent
- Europe
- Country
- Greece
- City
- Kos
- Population
- 19.2K
- Coordinates
- 36.89°, 27.29°
Seasonal Breakdown
Spring
Mar–May
Avg High 18°C
Avg Low 16°C
Rain 5 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 27°C
Avg Low 24°C
Rain 0 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 23°C
Avg Low 20°C
Rain 5 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 15°C
Avg Low 13°C
Rain 12 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 15°C / 12°C . Feb: 15°C / 12°C . Mar: 16°C / 13°C . Apr: 18°C / 15°C . May: 21°C / 18°C . Jun: 25°C / 22°C . Jul: 27°C / 25°C . Aug: 27°C / 25°C . Sep: 26°C / 23°C . Oct: 23°C / 20°C . Nov: 20°C / 17°C . Dec: 16°C / 14°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 199 mm. Feb: 87 mm. Mar: 74 mm. Apr: 31 mm. May: 11 mm. Jun: 5 mm. Jul: 0 mm. Aug: 0 mm. Sep: 9 mm. Oct: 36 mm. Nov: 129 mm. Dec: 196 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 68%. Mar: 70%. Apr: 75%. May: 77%. Jun: 76%. Jul: 72%. Aug: 76%. Sep: 72%. Oct: 71%. Nov: 70%. Dec: 69%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 36 km/h . Feb: 35 km/h . Mar: 34 km/h . Apr: 30 km/h . May: 29 km/h . Jun: 30 km/h . Jul: 34 km/h . Aug: 30 km/h . Sep: 31 km/h . Oct: 28 km/h . Nov: 30 km/h . Dec: 34 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 9h. Mar: 10h. Apr: 11h. May: 13h. Jun: 14h. Jul: 13h. Aug: 13h. Sep: 11h. Oct: 10h. Nov: 8h. Dec: 8h.
Sea Temperature
Sea Temperature swim
Line chart showing monthly sea temperature. Jan: 19°C . Feb: 18°C . Mar: 18°C . Apr: 18°C . May: 20°C . Jun: 23°C . Jul: 26°C . Aug: 27°C . Sep: 26°C . Oct: 25°C . Nov: 22°C . Dec: 21°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 6. Apr: UV 7. May: UV 7. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 6. Oct: UV 5. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending wetter by about 19 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 28°C | Aug · 27°C |
| Coldest month | Feb 2025 · 10°C | Jan · 12°C |
| Wettest month | Dec 2025 · 225 mm | Jan · 199 mm |
| Windiest month | Feb 2025 · 34 km/h | Jan · 36 km/h |
Month-by-Month Weather Table
January
Wet 
February
Fair March
Good April
Good May best
Excellent June best
Excellent July
Excellent August best
Excellent September best
Excellent October best
Excellent November
Good December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 15°C / 12°C | 11°C / 7°C | 14days (199 mm) Wet | 7.9h Good | 67% Muggy | 2.9 Moderate | Wet | View Details |
| February | 15°C / 12°C | 12°C / 8°C | 10days (87 mm) Wet | 8.9h Good | 68% Muggy | 4.2 Moderate | Fair | View Details |
| March | 16°C / 13°C | 13°C / 9°C | 8days (74 mm) Wet | 10.3h Excellent | 70% Muggy | 5.7 High | Good | View Details |
| April | 18°C / 15°C | 17°C / 13°C | 4days (31 mm) Good | 11.4h Excellent | 75% Muggy | 6.7 High | Good | View Details |
| May best | 21°C / 18°C | 22°C / 17°C | 3days (11 mm) Excellent | 12.5h Excellent | 77% Humid | 7.4 Very High | Excellent | View Details |
| June best | 25°C / 22°C | 27°C / 23°C | 1days (5 mm) Excellent | 13.5h Excellent | 76% Humid | 8 Very High | Excellent | View Details |
| July | 27°C / 25°C | 30°C / 25°C | 0days (0 mm) Excellent | 13.3h Excellent | 72% Muggy | 8.1 Very High | Excellent | View Details |
| August best | 27°C / 25°C | 31°C / 26°C | 0days (0 mm) Excellent | 12.5h Excellent | 76% Humid | 7.6 Very High | Excellent | View Details |
| September best | 26°C / 23°C | 27°C / 23°C | 1days (9 mm) Excellent | 11.4h Excellent | 72% Muggy | 6.4 High | Excellent | View Details |
| October best | 23°C / 20°C | 23°C / 19°C | 3days (36 mm) Excellent | 9.9h Good | 71% Muggy | 4.9 Moderate | Excellent | View Details |
| November | 20°C / 17°C | 19°C / 15°C | 10days (129 mm) Wet | 8.4h Good | 70% Muggy | 3.5 Moderate | Good | View Details |
| December | 16°C / 14°C | 14°C / 10°C | 13days (196 mm) Wet | 7.5h Good | 69% Muggy | 2.7 Moderate | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Kos are May, June, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Kos, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Kos is August, with average daytime highs of 27°C (81°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Kos is January, with average overnight lows of 12°C (53°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Kos is January, averaging 199mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Kos runs through January, December, February, November, with the heaviest rainfall in January. Based on 10-year averages for Kos.
Kos receives approximately 128 sunshine hours per year. The sunniest month is June with around 14 hours. Based on climate data for Kos.
The least favorable months to visit Kos are January, February, primarily due to frequent rain. For the best conditions, consider May, June, August, September, October instead.
The annual average UV index in Kos is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Kos is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in June, July, August, September, October, November average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Kos are 32 km/h (20 mph). The windiest month is January with peak winds reaching 36 km/h (22 mph) (gusts up to 51 km/h / 32 mph).
Kos averages 16 clear-sky days per month with overall cloud cover around 27%. The clearest skies occur in July.
The annual average dew point in Kos is 14°C (57°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Kos has a Hot-Summer Mediterranean climate, classified as Csa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Kos ranges from 16°C (61°F) to 20°C (68°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Kos. It earns a climate score of 10/10 with Excellent.
For June in Kos, pack Windbreaker, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 25°C (77°F) and 1 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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