Heraklion climate — normals and trends
Heraklion (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.3 °C and it receives 444 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 July (25.1 °C on average) and the coldest is January (9.9 °C). Rainfall peaks in January.
Heraklion averages 0 frost days, 44 hot days (≥ 30 °C) and 75 rainy days per year.
Heraklion has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The hottest day of the period reached 43.5 °C (on 20 July 1973) and the coldest -2.1 °C (on 20 February 1983).
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
HeraklionCrete
- coords
- 35.33°, 25.14°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.3°C
Average daily high
21.6°C
Average daily low
13.6°C
Annual rainfall
444mm
Sunshine / day
11.0h
Mean relative humidity
70%
Average peak wind
14.3km/h
Seasonal range
15.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
44 d/yr
Rainy days (≥ 1 mm)
75 d/yr
Annual snowfall
1.9 cm
Average feels-like high
20.9 °C
Average feels-like low
12.9 °C
Average peak gust
39.5 km/h
Tropical nights (≥ 20 °C)
59 d/yr
Solar radiation
18.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.53 · 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
43.5 °C
20 July 1973
Coldest day
-2.1 °C
20 February 1983
Wettest day
83 mm
15 October 2022
Windiest day
40.6 km/h
10 April 2015
Strongest gust
100.4 km/h
10 April 2015
Hottest feels-like
43.4 °C
27 June 2014
Coldest feels-like
-6.4 °C
9 February 1976
Snowiest day
12.3 cm
25 January 2004
Sunniest day
13.9 h
23 June 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 | 16.6 °C | +3.2 °C | 29 mm | -39 mm |
| Feb | 12.1 °C | -1.9 °C | 55 mm | -8 mm |
| Mar | 19.4 °C | +3.4 °C | 28 mm | -32 mm |
| Apr | 18.9 °C | -1.1 °C | 98 mm | +62 mm |
| May | 25.4 °C | +0.7 °C | 44 mm | +16 mm |
| Jun | 28.4 °C | -0.1 °C | 3 mm | -8 mm |
| Jul | 32.2 °C | +2.6 °C | 0 mm | -3 mm |
| Aug | 30.1 °C | +0.6 °C | 3 mm | -2 mm |
| Sep | 27.2 °C | +0.2 °C | 1 mm | -17 mm |
| Oct | 23.6 °C | +0.6 °C | 26 mm | -18 mm |
| Nov | 21.3 °C | +2.5 °C | 29 mm | -18 mm |
| Dec | 16.3 °C | +1.4 °C | 58 mm | -4 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 Heraklion?
Heraklion has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.3 °C and it receives 444 mm of precipitation per year.
What is the hottest day ever recorded in Heraklion?
The hottest day measured in Heraklion between 1940 and 2025 was 20 July 1973, reaching 43.5 °C.
What is the coldest day in Heraklion?
The coldest day measured in Heraklion between 1940 and 2025 was 20 February 1983, at -2.1 °C.
Does it snow in Heraklion?
Yes. Heraklion gets on average 1.9 cm of snow per year and has around 0 frost days.
Has the climate of Heraklion warmed?
Yes: Heraklion warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Heraklion?
The wettest day measured in Heraklion between 1940 and 2025 was 15 October 2022, with 83 mm of rain in 24 hours.
What was the windiest day in Heraklion?
The windiest day measured in Heraklion between 1940 and 2025 was 10 April 2015, with winds reaching 40.6 km/h.
What is the warmest month in Heraklion?
The warmest month in Heraklion is July (25.1 °C on average); the coldest is January (9.9 °C).
How much does it rain in Heraklion?
Heraklion receives on average 444 mm of precipitation per year, spread over about 75 rainy days.
Is it sunny in Heraklion?
Heraklion 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 Heraklion?
The heaviest 24-hour snowfall measured in Heraklion between 1940 and 2025 was 25 January 2004, with 12.3 cm.
Are there tropical nights in Heraklion?
Yes: Heraklion has on average 59 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Heraklion?
In Heraklion, between 1940 and 2025, the highest apparent temperature reached 43.4 °C on 27 June 2014, and the lowest was -6.4 °C on 9 February 1976.
Compare Heraklion with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Heraklion