Irun in Fall
In fall (September, October and November), Irun sees average daytime highs around 18°C and overnight lows near 11°C, with 373 mm of precipitation over about 42 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 23°C in early September to 12°C by late November. The sky is clear or mostly clear about 25% of the time across fall, and the air most often feels dry.
Fall is Irun's 2nd-best season to visit on our travel score. For the whole year in context, see Irun's year-round climate.
- Avg daytime high
- 18°C
- 2nd-warmest season
- Avg overnight low
- 11°C
- Precipitation
- 373 mm
- 42 wet days
- Avg wind
- 10 km/h
- Travel score
- 4.9
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Irun in Fall
Over the season highs ease from about 23°C in early September to 12°C by late November.
A typical fall day in Irun reaches about 18°C and drops to 11°C overnight. The warmest of the three months is September, the coolest November.
Irun weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 10° / 5° | 123 | 14.7 | 1.2 | 9.2 | 2.1 |
| Feb | 11° / 5° | 111 | 13.3 | 1.9 | 10.2 | 2.4 |
| Mar | 14° / 6° | 107 | 13.9 | 0.9 | 11.6 | 3.6 |
| Apr | 15° / 8° | 127 | 16.3 | 0.1 | 13.2 | 3.9 |
| May | 18° / 11° | 124 | 15.3 | 0 | 14.5 | 5.1 |
| Jun | 21° / 14° | 98 | 12.6 | 0 | 15.2 | 6.0 |
| Jul | 23° / 15° | 83 | 12.3 | 0 | 14.9 | 6.5 |
| Aug | 24° / 16° | 90 | 12.6 | 0 | 13.8 | 6.7 |
| Sep | 21° / 14° | 96 | 12.7 | 0 | 12.3 | 6.1 |
| Oct | 18° / 11° | 124 | 13.8 | 0 | 10.8 | 5.3 |
| Nov | 14° / 8° | 153 | 15.4 | 0.2 | 9.5 | 3.3 |
| Dec | 11° / 5° | 126 | 14.5 | 0.8 | 8.8 | 2.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 25% of the time across fall.
Chance of precipitation in Fall
Irun gets around 373 mm of rain and snow over 42 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 10 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 hours in early September to 9 hours by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 2.9 kWh/m².
Is fall a good time to visit Irun?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Irun for sightseeing.
What to pack for Irun in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Irun sees daytime highs around 18°C and nights near 11°C. Pack rain gear. Worth having: a warm layer. About 42 days see rain.
Sea temperature near Irun in Fall
The nearest coast averages about 18°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 22°C and coldest in February near 12°C.
It's comfortable for a long swim from Jul 1 to Sep 25 — about 2.9 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 13 | 12 | 13 | 14 | 16 | 19 | 21 | 22 | 21 | 18 | 16 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 13 | Bracing |
| Feb | 12 | Bracing |
| Mar | 13 | Bracing |
| Apr | 14 | Bracing |
| May | 16 | Cool |
| Jun | 19 | Cool |
| Jul | 21 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 18 | Cool |
| Nov | 16 | Cool |
| Dec | 14 | Bracing |
UV index in Irun in Fall
Clear-sky midday UV across fall averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Irun peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 2 | 5 | 6 | 6 | 8 | 8 | 8 | 5 | 4 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 2 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Irun in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Irun is worst in February — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 16 | 15 | 12 | 9 | 9 | 9 | 9 | 9 | 8 | 7 | 8 |
| Level | Good | Moderate | Moderate | Good | Good | Good | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 16 | Moderate |
| Mar | 15 | Moderate |
| Apr | 12 | Good |
| May | 9 | Good |
| Jun | 9 | Good |
| Jul | 9 | Good |
| Aug | 9 | Good |
| Sep | 9 | Good |
| Oct | 8 | Good |
| Nov | 7 | Good |
| Dec | 8 | Good |
Where is Irun?
Irun sits at 43.3°N, 1.8°W, 23 m above sea level, in Spain. The nearest listed city is Hondarribia, 3.0 km away.
Topography around Irun
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Irun.
Within 3 km, the terrain around Irun has significant variations in elevation — a maximum elevation change of 342 m around an average of 53 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 883 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,044 m.
The land around Irun is covered by trees (47%) and artificial surfaces (26%) within 3 km, trees (45%) and water (36%) within 16 km, and trees (47%) and water (25%) within 80 km.
Spain travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $38,627
- 2025
- Happiness
- 6.5 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 3.9
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 540
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Irun (43.339°, -1.7894°, elevation 23 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.