San Isidro weather in December

In December, San Isidro sees average daytime highs of 11°C and overnight lows near 3°C, with 43 mm of precipitation across 6.8 wet days and about 9.2 hours of daylight. It is the 11th-warmest and 4th-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 36% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of December to 9 h 12 min by month's end. Set against the rest of the year, December is San Isidro's 12th-clearest and 12th-windiest month. For the whole year in context, see San Isidro's year-round climate.

Daytime high
11°
11th warmest
Overnight low
3rd coldest
Precipitation
43 mm
6.8 wet days
Daylight
9 h 06 min
8:37 AM – 5:45 PM
Cloud cover
56%
12th clearest
Wind
8 km/h
12th windiest
Solar energy
1.83 kWh/m²
Travel score
2.8
out of 10
Air quality
Good
PM2.5 6.8 µg/m³ · 2019

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 San Isidro reaches about 11°C in the afternoon and slips back to 3°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 14°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)
1123
2123
3123
4113
5113
6113
7113
8113
9113
10113
11113
12113
13113
14113
15113
16112
17112
18112
19112
20112
21112
22112
23102
24102
25102
26102
27102
28102
29102
30102
31102

How December really feels in San Isidro

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 11 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
11
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

San Isidro weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 386.70.69.42.6
Feb13° / 325.60.710.43.9
Mar16° / 396.50.211.75.6
Apr19° / 447.50136.4
May23° / 11°376.6014.27.4
Jun29° / 16°153.3014.86.7
Jul33° / 18°61.4014.64.6
Aug32° / 18°82013.64.9
Sep27° / 14°213.8012.37.4
Oct20° / 10°587.3010.96.9
Nov14° / 536.909.84.5
Dec11° / 436.80.49.22.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24852
34753
44753
54753
64753
74654
84753
94753
104753
114654
124753
134753
144654
154753
164852
174753
184852
194951
204951
215050
224951
234951
244951
254951
265050
275050
285050
295050
305050
315050

Chance of precipitation in December

Any precipitationSnow

San Isidro gets around 43 mm of rain and snow over 6.8 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 22% and peaks near 24% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
1241
2241
3241
4241
5241
6231
7231
8231
9221
10221
11221
12211
13211
14201
15201
16201
17201
18201
19201
20201
21201
22211
23211
24211
25221
26221
27221
28231
29231
30232
31232

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 8 km/h in December, the calmest month.

Across December, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 18 min at the start of December to 9 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 8:25 AM to 8:43 AM, and sunset from 5:45 PM to 5:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.38:255:45
29.38:265:44
39.38:275:44
49.38:285:44
59.38:295:44
69.28:295:44
79.28:305:44
89.28:315:44
99.28:325:44
109.28:335:44
119.28:345:44
129.28:345:44
139.28:355:44
149.18:365:45
159.18:365:45
169.18:375:45
179.18:385:45
189.18:385:46
199.18:395:46
209.18:395:46
219.18:405:47
229.18:405:47
239.18:415:48
249.18:415:48
259.18:425:49
269.18:425:49
279.18:425:50
289.18:435:51
299.18:435:51
309.18:435:52
319.28:435:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.83 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.83 kWh/m² to a high of 7.78 kWh/m² in July across the year — December's 1.83 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.9Dim
21.9Dim
31.9Dim
41.9Dim
51.9Dim
61.9Dim
71.9Dim
81.9Dim
91.9Dim
101.8Dim
111.8Dim
121.8Dim
131.8Dim
141.8Dim
151.8Dim
161.8Dim
171.8Dim
181.8Dim
191.8Dim
201.8Dim
211.8Dim
221.8Dim
231.8Dim
241.8Dim
251.8Dim
261.8Dim
271.8Dim
281.8Dim
291.8Dim
301.8Dim
311.8Dim
Planning a trip in December

Is December a good time to visit San Isidro?

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

2.8
Sightseeing
11th-best month of the year
0.0
Beach & pool
11th-best month of the year

December is a weaker month for outdoor sightseeing in San Isidro.

What to pack for San Isidro in December

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

In December, San Isidro sees daytime highs around 11°C and nights near 3°C. Pack a warm layer. About 7 days see rain.

a warm layer

UV index in San Isidro in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Isidro peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 15UV 10Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb2Moderate
Mar6High
Apr7High
May7High
Jun9Very high
Jul10Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is San Isidro?

San Isidro sits at 40.4°N, 3.7°W, 614 m above sea level, in Spain. The nearest listed city is Carabanchel, 1.0 km away.

Topography around San Isidro

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Isidro.

Within 3 km, the terrain around San Isidro has only modest variations in elevation — a maximum elevation change of 112 m around an average of 621 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 218 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,009 m.

The land around San Isidro is covered by artificial surfaces (68%) and trees (23%) within 3 km, artificial surfaces (43%) and grassland (27%) within 16 km, and cropland (37%), grassland (35%) and trees (20%) within 80 km.

3 km
112 m
16 km
218 m
80 km
2,009 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Carabanchel 1.0 km · Cármenes 1.0 km · Opañel 1.0 km · Imperial 1.0 km · Comillas 1.0 km · Puerta del Angel 1.0 km · Latina 2.0 km · Acacias 2.0 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 San Isidro (40.3966°, -3.7283°, elevation 614 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).