Kos climate by month
What the weather is like
Kos has a hot-summer Mediterranean climate (Köppen Csa): dry, sunny summers and mild, wetter winters.
The warmest month is August, when afternoons average 27° and nights 23°. January is the coolest month, with highs of 16° and lows of 11°. The difference between the warmest and the coolest month is about 11°.
About 621 mm of precipitation falls in an average year. January is the wettest month (130 mm, 13 wet days) and July the driest (0 mm, 1 wet days). Cloud cover ranges from 1% in July to 29% in December.
The sea reaches about 25° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Athens, the capital, Kos is 8° cooler on a August afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 27° · August
- Coldest nights
- 11° · February
- Wettest month
- January
- Driest month
- July
- Clearest skies
- July · 1% cloud
- Warmest sea
- 25° · August
- Longest day
- 14 h 41 min
- Shortest day
- 9 h 39 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 16° | 16° | 17° | 19° | 21° | 24° | 26° | 27° | 25° | 24° | 21° | 18° |
| Average low | 11° | 11° | 12° | 14° | 17° | 21° | 23° | 23° | 21° | 19° | 15° | 13° |
| Precipitation | 130 mm | 98 mm | 69 mm | 34 mm | 15 mm | 2 mm | 0 mm | 1 mm | 7 mm | 37 mm | 94 mm | 134 mm |
| Wet days (≥1 mm) | 13.3 | 11 | 7.5 | 6.2 | 4.5 | 1.7 | 0.6 | 0.7 | 2.2 | 5.1 | 8.6 | 12.8 |
| Cloud cover | 28% | 27% | 24% | 21% | 14% | 4% | 1% | 1% | 4% | 14% | 25% | 29% |
| Sea temperature | 17° | 17° | 17° | 17° | 19° | 22° | 24° | 25° | 24° | 23° | 21° | 19° |
| Daylight | 9h 54 | 10h 50 | 11h 55 | 13h 07 | 14h 08 | 14h 41 | 14h 27 | 13h 36 | 12h 27 | 11h 17 | 10h 13 | 9h 39 |
| Saharan dust haze | – | – | ● | ●● | ●● | ● | – | – | – | – | – | – |
| Month score | 58 | 64 | 78 | 85 | 89 | 96 | 96 | 92 | 95 | 88 | 80 | 67 |
Dust haze, monthly average 2015–2024: ● occasional, ●● frequent, ●●● very frequent