Irun weather in December

In December, Irun sees average daytime highs of 11°C and overnight lows near 5°C, with 126 mm of precipitation across 14.5 wet days and about 8.8 hours of daylight. It is the 11th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 11°C through the month. The sky is clear or mostly clear about 18% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 hours at the start of December to 8 h 48 min by month's end. Set against the rest of the year, December is Irun's 12th-clearest and 1st-windiest month. For the whole year in context, see Irun's year-round climate.

Daytime high
11°
11th warmest
Overnight low
3rd coldest
Precipitation
126 mm
14.5 wet days
Daylight
8 h 48 min
8:39 AM – 5:27 PM
Cloud cover
70%
12th clearest
Wind
11 km/h
1st windiest
Solar energy
1.38 kWh/m²
Travel score
2.4
out of 10

Irun is capital town of the municipality of Irun, Spain.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 11°C through the month.

A typical December day in Irun reaches about 11°C in the afternoon and slips back to 5°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 15°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1126
2126
3116
4116
5116
6116
7116
8116
9116
10116
11116
12116
13115
14115
15115
16115
17115
18115
19115
20115
21115
22115
23115
24115
25115
26115
27115
28115
29115
30115
31105

Irun weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 12314.71.29.22.1
Feb11° / 11113.31.910.22.4
Mar14° / 10713.90.911.63.6
Apr15° / 12716.30.113.23.9
May18° / 11°12415.3014.55.1
Jun21° / 14°9812.6015.26.0
Jul23° / 15°8312.3014.96.5
Aug24° / 16°9012.6013.86.7
Sep21° / 14°9612.7012.36.1
Oct18° / 11°12413.8010.85.3
Nov14° / 15315.40.29.53.3
Dec11° / 12614.50.88.82.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 69%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
42971
52971
63070
73070
83169
93169
103169
113169
123268
133268
143268
153268
163268
173268
183268
193169
203169
213169
223169
233070
243169
253169
263169
273169
283268
293367
303367
313367

Chance of precipitation in December

Any precipitationSnow

Irun gets around 126 mm of rain and snow over 14.5 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 47% and peaks near 51% on the wettest days, and about 1 day brings snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
1512
2512
3512
4512
5502
6502
7492
8492
9482
10483
11473
12473
13463
14463
15453
16453
17443
18443
19443
20443
21443
22453
23453
24453
25452
26452
27452
28452
29463
30463
31463

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 11 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 hours at the start of December to 8 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 8:26 AM to 8:46 AM, and sunset from 5:28 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.08:265:28
29.08:275:27
39.08:285:27
49.08:295:27
58.98:305:27
68.98:315:27
78.98:325:26
88.98:335:26
98.98:345:26
108.98:355:26
118.88:365:26
128.88:365:27
138.88:375:27
148.88:385:27
158.88:395:27
168.88:395:27
178.88:405:28
188.88:415:28
198.88:415:28
208.88:425:29
218.88:425:29
228.88:435:30
238.88:435:30
248.88:445:31
258.88:445:31
268.88:445:32
278.88:455:32
288.88:455:33
298.88:455:34
308.88:455:34
318.88:465:35

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.38 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.38 kWh/m² to a high of 5.85 kWh/m² in June across the year — December's 1.38 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.5Dim
21.5Dim
31.4Dim
41.4Dim
51.4Dim
61.4Dim
71.4Dim
81.4Dim
91.4Dim
101.4Dim
111.4Dim
121.4Dim
131.4Dim
141.4Dim
151.4Dim
161.4Dim
171.4Dim
181.4Dim
191.4Dim
201.4Dim
211.4Dim
221.4Dim
231.4Dim
241.4Dim
251.4Dim
261.4Dim
271.4Dim
281.4Dim
291.4Dim
301.4Dim
311.4Dim
Planning a trip in December

Is December a good time to visit Irun?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.4
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Irun.

What to pack for Irun in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Irun sees daytime highs around 11°C and nights near 5°C. Pack a warm layer and rain gear. About 15 days see rain.

a warm layerrain gear

Sea temperature near Irun in December

The nearest coast averages about 14°C in December — 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.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar13Bracing
Apr14Bracing
May16Cool
Jun19Cool
Jul21Refreshing
Aug22Refreshing
Sep21Refreshing
Oct18Cool
Nov16Cool
Dec14Bracing

UV index in Irun in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 15UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar5Moderate
Apr6High
May6High
Jun8Very high
Jul8Very high
Aug8Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Irun in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodFeb 2116 µg/m³Nov 207 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb16Moderate
Mar15Moderate
Apr12Good
May9Good
Jun9Good
Jul9Good
Aug9Good
Sep9Good
Oct8Good
Nov7Good
Dec8Good
Location & terrain

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.

3 km
342 m
16 km
883 m
80 km
2,044 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Hondarribia 3.0 km · Errenteria 10 km · Pasaia 11 km · San Sebastian 15 km · Hernani 17 km · Lasarte 20 km · Oria 21 km · Biarritz 25 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
Roman Catholic 58%atheist 16%agnostic 11%non-believer 11%

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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).