San Onofre weather in December

In December, San Onofre sees average daytime highs of 30°C and overnight lows near 25°C, with 80 mm of rain across 14.3 wet days and about 11.4 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 34% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 30 min at the start of December to 11 h 24 min by month's end. Set against the rest of the year, December is San Onofre's 4th-clearest and 5th-windiest month. For the whole year in context, see San Onofre's year-round climate.

Daytime high
30°
8th warmest
Overnight low
25°
4th coldest
Rainfall
80 mm
14.3 wet days
Daylight
11 h 24 min
6:15 AM – 5:41 PM
Cloud cover
58%
4th clearest
Wind
8 km/h
5th windiest
Solar energy
4.92 kWh/m²
Travel score
4.7
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical December day in San Onofre reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293025
303024
313024

How December really feels in San Onofre

Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

San Onofre weather by month

How December compares with the rest of the year at a glance. December is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°195.111.55.6
Feb31° / 25°205.611.75.1
Mar31° / 25°431211.94.5
Apr30° / 25°11922.312.23.4
May30° / 25°22028.212.42.9
Jun30° / 25°21026.112.62.9
Jul30° / 25°18925.712.53.0
Aug30° / 25°20727.312.32.9
Sep29° / 25°22028.212.12.9
Oct29° / 25°2512911.83.0
Nov29° / 25°19025.111.63.4
Dec30° / 25°8014.311.44.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23664
33664
43664
53763
63763
73763
83763
93961
104060
114159
124159
134357
144456
154654
164852
175050
185248
195446
205644
215743
225941
236139
246238
256436
266535
276634
286733
296733
306832
316931

Chance of precipitation in December

Any precipitation

San Onofre gets around 80 mm of rain over 14.3 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 47% and peaks near 68% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
168
267
365
464
563
662
761
860
958
1057
1155
1254
1352
1450
1548
1646
1745
1843
1941
2039
2138
2236
2335
2433
2532
2631
2730
2829
2928
3027
3127

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 62% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
105545
205545
305545
405545
505644
605644
705743
805743
905842
1005842
1105941
1205941
1306040
1406040
1506139
1606238
1706238
1806337
1906436
2006436
2106535
2206634
2316534
2416633
2516633
2616732
2716831
2816930
2926929
3027127
3127226

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 8 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
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 30 min at the start of December to 11 h 24 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 6:08 AM to 6:22 AM, and sunset from 5:36 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:085:36
211.56:085:36
311.56:095:37
411.56:095:37
511.56:105:37
611.56:105:37
711.56:115:38
811.46:115:38
911.46:125:39
1011.46:125:39
1111.46:135:39
1211.46:135:40
1311.46:145:40
1411.46:145:40
1511.46:155:41
1611.46:155:41
1711.46:165:42
1811.46:165:42
1911.46:175:43
2011.46:175:43
2111.46:185:44
2211.46:185:44
2311.46:195:44
2411.46:195:45
2511.46:205:45
2611.46:205:46
2711.46:205:46
2811.46:215:47
2911.46:215:47
3011.46:225:48
3111.46:225:48

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.92 kWh/m².

For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 5.97 kWh/m² in March across the year — December's 4.92 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in December

Is December a good time to visit San Onofre?

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

4.7
Sightseeing
3rd-best month of the year
6.3
Beach & pool
4th-best month of the year

December is a reasonable time to visit San Onofre for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Onofre in December

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

In December, San Onofre sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 14 days see rain.

light clothesrain gearsun protection

Sea temperature near San Onofre in December

The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in July at about 30°C and coldest in March near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb28Tropical
Mar28Tropical
Apr29Tropical
May29Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in San Onofre in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 10 (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 Onofre peaks around June 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 10 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highJun 10UV 13Dec 13UV 10
UV index (midday)Level
Jan11Extreme
Feb12Extreme
Mar12Extreme
Apr12Extreme
May13Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec10Very high

Air quality in San Onofre 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 Onofre is worst in July — around 26 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 2325 µg/m³Nov 1111 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb18Moderate
Mar26Moderate
Apr25Moderate
May25Moderate
Jun23Moderate
Jul26Moderate
Aug20Moderate
Sep14Moderate
Oct12Good
Nov11Good
Dec14Moderate
Location & terrain

Where is San Onofre?

San Onofre sits at 9.7°N, 75.5°W, 37 m above sea level, in Colombia. The nearest listed city is Santiago de Tolú, 24 km away.

Topography around San Onofre

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

Within 3 km, the terrain around San Onofre has only modest variations in elevation — a maximum elevation change of 53 m around an average of 27 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 232 m; within 80 km, large variations in elevation — a maximum elevation change of 810 m.

The land around San Onofre is covered by grassland (79%) within 3 km, grassland (52%) and trees (33%) within 16 km, and grassland (39%), water (32%) and trees (23%) within 80 km.

3 km
53 m
16 km
232 m
80 km
810 m
treesshrubsgrasslandartificial surfaceswaterwetlandmangroves
December weather nearby: Santiago de Tolú 24 km · Tolú Viejo 33 km · María la Baja 37 km · El Carmen de Bolívar 45 km · San Pablo 45 km · San Jacinto 45 km · San Antero 48 km · Sincelejo 50 km

Colombia travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
120 / 240 V · 60 Hz
Prices
≈ 38% of US
price level, 2025
GDP per capita
$8,562
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
74%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
15.4
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 480
Religion
Roman Catholic 64%Protestant 17%none 14%atheist 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 Onofre (9.7359°, -75.5263°, elevation 37 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).