San Clemente weather in December

In December, San Clemente sees average daytime highs of 27°C and overnight lows near 12°C, with 17 mm of rain across 1.7 wet days and about 14.4 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 25°C in the first days to 28°C by the end. The sky is clear or mostly clear about 77% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 12 min at the start of December to 14 h 24 min by month's end. Set against the rest of the year, December is San Clemente's 4th-clearest and 1st-windiest month. For the whole year in context, see San Clemente's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
17 mm
1.7 wet days
Daylight
14 h 24 min
6:30 AM – 8:54 PM
Cloud cover
23%
4th clearest
Wind
9 km/h
1st windiest
Solar energy
8.74 kWh/m²
Travel score
8.6
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 25°C in the first days to 28°C by the end.

A typical December day in San Clemente reaches about 27°C in the afternoon and slips back to 12°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, December runs about 3°C warmer than November and about 2°C cooler than January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12511
22511
32511
42511
52611
62612
72612
82612
92612
102612
112612
122612
132612
142612
152612
162712
172712
182712
192712
202712
212712
222712
232713
242713
252713
262713
272713
282813
292813
302813
312813

San Clemente weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 14°5114.18.0
Feb28° / 13°80.913.38.5
Mar25° / 12°151.612.38.8
Apr20° / 544.411.17.5
May16° / 1448.410.25.3
Jun14° / 221129.63.7
Jul13° / 16010.29.83.8
Aug15° / 1319.310.74.6
Sep17° / 736.811.86.0
Oct20° / 475.312.97.2
Nov24° / 10°192.413.98.6
Dec27° / 12°171.714.48.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 77% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 9% of December, with mostly cloudy or overcast conditions the remaining 14%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18218
28218
38218
48218
58218
68317
78317
88317
98317
108416
118416
128416
138416
148614
158614
168614
178614
188614
198614
208614
218812
228812
238812
248812
258812
268911
278911
288911
298911
309010
31919

Chance of precipitation in December

Any precipitation

San Clemente gets around 17 mm of rain over 1.7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 6% and peaks near 7% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
16
27
37
47
57
67
77
87
97
106
116
126
136
146
156
166
176
186
195
205
215
225
235
245
254
264
274
284
294
304
314

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 81% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19190
290100
388120
487130
586140
685150
784160
883170
982171
1081181
1181181
1280191
1380191
1480191
1580191
1680191
1780191
1880191
1980191
2080191
2179201
2279201
2378211
2477221
2577221
2676231
2775241
2874251
2973261
3073261
3172271

Wind in December

Winds average 9 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 12 min at the start of December to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over December. Sunrise moves from 6:29 AM to 6:38 AM, and sunset from 8:43 PM to 9:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.26:298:43
214.26:298:43
314.36:298:44
414.36:298:45
514.36:298:46
614.36:298:47
714.36:298:48
814.36:298:48
914.36:298:49
1014.36:298:50
1114.46:298:51
1214.46:298:51
1314.46:308:52
1414.46:308:53
1514.46:308:53
1614.46:308:54
1714.46:318:54
1814.46:318:55
1914.46:318:56
2014.46:328:56
2114.46:328:57
2214.46:338:57
2314.46:338:58
2414.46:348:58
2514.46:348:58
2614.46:358:59
2714.46:358:59
2814.46:368:59
2914.46:379:00
3014.46:379:00
3114.46:389:00

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 8.74 kWh/m².

For context, solar energy here swings from a low near 2.04 kWh/m² to a high of 8.75 kWh/m² in January across the year — December's 8.74 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
18.5Intense
28.5Intense
38.5Intense
48.5Intense
58.5Intense
68.6Intense
78.6Intense
88.6Intense
98.6Intense
108.6Intense
118.7Intense
128.7Intense
138.7Intense
148.7Intense
158.7Intense
168.8Intense
178.8Intense
188.8Intense
198.8Intense
208.8Intense
218.8Intense
228.9Intense
238.9Intense
248.9Intense
258.9Intense
268.9Intense
278.9Intense
288.9Intense
298.9Intense
309.0Intense
319.0Intense
Planning a trip in December

Hazard calendar for San Clemente

In seasonPeak

None of San Clemente's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

San Clemente's rainy season runs May–August, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit San Clemente?

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

8.6
Sightseeing
2nd-best month of the year
8.4
Beach & pool
3rd-best month of the year

December is one of the better times to visit San Clemente for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Clemente in December

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

In December, San Clemente sees daytime highs around 27°C and nights near 12°C. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

UV index in San Clemente in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Clemente peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 15 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateVery highExtremeJan 15UV 13Jun 15UV 2
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar9Very high
Apr5High
May3Moderate
Jun2Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme

Air quality in San Clemente 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 San Clemente is worst in February — around 26 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 12 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateFeb 1425 µg/m³Dec 1412 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb26Moderate
Mar16Moderate
Apr19Moderate
May25Moderate
Jun21Moderate
Jul22Moderate
Aug21Moderate
Sep20Moderate
Oct16Moderate
Nov15Moderate
Dec12Good
Location & terrain

Where is San Clemente?

San Clemente sits at 35.5°S, 71.5°W, 214 m above sea level, in Chile. The nearest listed city is Colbún, 19 km away.

Topography around San Clemente

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

Within 3 km, the terrain around San Clemente has only modest variations in elevation — a maximum elevation change of 55 m around an average of 204 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 596 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,923 m.

The land around San Clemente is covered by cropland (63%) within 3 km, cropland (45%), trees (25%) and grassland (22%) within 16 km, and trees (38%) and grassland (33%) within 80 km.

3 km
55 m
16 km
596 m
80 km
3,923 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Colbún 19 km · Talca 19 km · San Javier 23 km · Linares 36 km · Molina 51 km · Longaví 51 km · Sagrada Familia 61 km · Curicó 66 km

Chile travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
220 V · 50 Hz
Prices
≈ 48% of US
price level, 2025
GDP per capita
$17,995
2025
Happiness
6.3 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
6.3
per 100k, 2023
Road deaths
14.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 517
Religion
Catholic 57%none 26%Evangelical or Protestant 16%other Christians and traditions related to Christ 1%

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 Clemente (-35.5378°, -71.487°, elevation 214 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. 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).