Irun climate — normals and trends
Irun (Spain) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 1,361 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 (18.8 °C on average) and the coldest is January (6.4 °C). Rainfall peaks in November.
Irun averages 13 frost days, 5 hot days (≥ 30 °C) and 173 rainy days per year.
Irun has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 21 to 5 per year over the period.
The hottest day of the period reached 37.8 °C (on 18 July 2022) and the coldest -14.0 °C (on 16 January 1985).
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
IrunBasque Country
- coords
- 43.34°, -1.79°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
16.1°C
Average daily low
9.3°C
Annual rainfall
1,361mm
Sunshine / day
8.7h
Mean relative humidity
81%
Average peak wind
14.9km/h
Seasonal range
12.4°C
Frost days (< 0 °C)
13 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
173 d/yr
Annual snowfall
17.2 cm
Average feels-like high
15.2 °C
Average feels-like low
7.5 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.60 · 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
37.8 °C
18 July 2022
Coldest day
-14.0 °C
16 January 1985
Wettest day
72 mm
4 October 2013
Windiest day
51.7 km/h
29 December 1951
Strongest gust
143.3 km/h
29 December 1951
Hottest feels-like
41.5 °C
8 July 1982
Coldest feels-like
-18.5 °C
9 January 1985
Snowiest day
9.7 cm
10 January 1945
Sunniest day
14.8 h
3 July 1949
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 | 12.1 °C | +2.7 °C | 141 mm | +16 mm |
| Feb | 14.0 °C | +3.4 °C | 76 mm | -34 mm |
| Mar | 13.3 °C | +0.3 °C | 113 mm | +5 mm |
| Apr | 17.5 °C | +2.9 °C | 127 mm | +0 mm |
| May | 18.8 °C | +1.3 °C | 134 mm | +12 mm |
| Jun | 24.5 °C | +4.1 °C | 104 mm | +6 mm |
| Jul | 23.0 °C | +0.6 °C | 81 mm | -2 mm |
| Aug | 25.4 °C | +2.5 °C | 115 mm | +20 mm |
| Sep | 22.1 °C | +0.8 °C | 92 mm | -12 mm |
| Oct | 19.9 °C | +2.0 °C | 51 mm | -69 mm |
| Nov | 14.7 °C | +1.8 °C | 164 mm | +27 mm |
| Dec | 12.3 °C | +2.2 °C | 90 mm | -43 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 Irun?
Irun has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,361 mm of precipitation per year.
What is the hottest day ever recorded in Irun?
The hottest day measured in Irun between 1940 and 2025 was 18 July 2022, reaching 37.8 °C.
What is the coldest day in Irun?
The coldest day measured in Irun between 1940 and 2025 was 16 January 1985, at -14.0 °C.
Does it snow in Irun?
Yes. Irun gets on average 17.2 cm of snow per year and has around 13 frost days.
Has the climate of Irun warmed?
Yes: Irun warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Irun?
The wettest day measured in Irun between 1940 and 2025 was 4 October 2013, with 72 mm of rain in 24 hours.
What was the windiest day in Irun?
The windiest day measured in Irun between 1940 and 2025 was 29 December 1951, with winds reaching 51.7 km/h.
What is the warmest month in Irun?
The warmest month in Irun is August (18.8 °C on average); the coldest is January (6.4 °C).
How much does it rain in Irun?
Irun receives on average 1,361 mm of precipitation per year, spread over about 173 rainy days.
Is it sunny in Irun?
Irun gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Irun?
The heaviest 24-hour snowfall measured in Irun between 1940 and 2025 was 10 January 1945, with 9.7 cm.
Are there tropical nights in Irun?
Yes: Irun has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Irun?
In Irun, between 1940 and 2025, the highest apparent temperature reached 41.5 °C on 8 July 1982, and the lowest was -18.5 °C on 9 January 1985.
Compare Irun with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Irun