Kos climate — normals and trends
Kos (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 18.4 °C and it receives 871 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (24.9 °C on average) and the coldest is January (12.7 °C). Rainfall peaks in December.
Kos averages 0 frost days, 0 hot days (≥ 30 °C) and 76 rainy days per year.
Kos has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.0 °C (on 25 July 2025) and the coldest 0.7 °C (on 5 February 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
KosSouth Aegean
- coords
- 36.89°, 27.29°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.4°C
Average daily high
19.4°C
Average daily low
17.5°C
Annual rainfall
871mm
Sunshine / day
11.0h
Mean relative humidity
74%
Average peak wind
32.0km/h
Seasonal range
12.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
76 d/yr
Annual snowfall
0.0 cm
Average feels-like high
18.4 °C
Average feels-like low
15.0 °C
Average peak gust
43.9 km/h
Tropical nights (≥ 20 °C)
137 d/yr
Solar radiation
18.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.27 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
31.0 °C
25 July 2025
Coldest day
0.7 °C
5 February 1950
Wettest day
108 mm
2 February 1962
Windiest day
76.9 km/h
20 November 1964
Strongest gust
119.2 km/h
22 January 2004
Hottest feels-like
35.9 °C
10 August 2025
Coldest feels-like
-10.3 °C
9 February 1976
Snowiest day
0.6 cm
25 January 2004
Sunniest day
14.0 h
4 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 16.5 °C | +2.6 °C | 133 mm | -55 mm |
| Feb | 12.7 °C | -1.2 °C | 100 mm | -30 mm |
| Mar | 16.5 °C | +1.8 °C | 35 mm | -45 mm |
| Apr | 17.1 °C | +0.4 °C | 62 mm | +26 mm |
| May | 20.1 °C | +0.5 °C | 10 mm | -5 mm |
| Jun | 25.0 °C | +1.7 °C | 0 mm | -3 mm |
| Jul | 26.9 °C | +1.4 °C | 0 mm | -0 mm |
| Aug | 27.0 °C | +1.0 °C | 0 mm | -1 mm |
| Sep | 25.2 °C | +1.2 °C | 1 mm | -10 mm |
| Oct | 21.4 °C | +0.2 °C | 88 mm | +25 mm |
| Nov | 20.4 °C | +2.1 °C | 103 mm | -24 mm |
| Dec | 17.0 °C | +1.6 °C | 225 mm | +8 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Kos?
Kos has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 18.4 °C and it receives 871 mm of precipitation per year.
What is the hottest day ever recorded in Kos?
The hottest day measured in Kos between 1940 and 2025 was 25 July 2025, reaching 31.0 °C.
What is the coldest day in Kos?
The coldest day measured in Kos between 1940 and 2025 was 5 February 1950, at 0.7 °C.
Does it snow in Kos?
Almost never: Kos sees virtually no snow, with about 0 frost days per year.
Has the climate of Kos warmed?
Yes: Kos warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kos?
The wettest day measured in Kos between 1940 and 2025 was 2 February 1962, with 108 mm of rain in 24 hours.
What was the windiest day in Kos?
The windiest day measured in Kos between 1940 and 2025 was 20 November 1964, with winds reaching 76.9 km/h.
What is the warmest month in Kos?
The warmest month in Kos is August (24.9 °C on average); the coldest is January (12.7 °C).
How much does it rain in Kos?
Kos receives on average 871 mm of precipitation per year, spread over about 76 rainy days.
Is it sunny in Kos?
Kos gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kos?
The heaviest 24-hour snowfall measured in Kos between 1940 and 2025 was 25 January 2004, with 0.6 cm.
Are there tropical nights in Kos?
Yes: Kos has on average 137 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kos?
In Kos, between 1940 and 2025, the highest apparent temperature reached 35.9 °C on 10 August 2025, and the lowest was -10.3 °C on 9 February 1976.
Compare Kos with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kos