Yauco weather in December

In December, Yauco sees average daytime highs of 27°C and overnight lows near 23°C, with 22 mm of rain across 5 wet days and about 10.9 hours of daylight. It is the 8th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 62% of the time in December, and the air most often feels muggy.

Daylight stretches from about 11 hours at the start of December to 10 h 54 min by month's end. Set against the rest of the year, December is Yauco's 3rd-clearest and 6th-windiest month. For the whole year in context, see Yauco's year-round climate.

Daytime high
27°
8th warmest
Overnight low
23°
5th coldest
Rainfall
22 mm
5 wet days
Daylight
10 h 54 min
6:56 AM – 5:51 PM
Cloud cover
40%
3rd clearest
Wind
15 km/h
6th windiest
Solar energy
4.57 kWh/m²
Travel score
7.5
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical December day in Yauco reaches about 27°C in the afternoon and slips back to 23°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 28°C. Set against its neighbours, December runs on par with November and on par with January.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12823
22823
32823
42823
52723
62723
72723
82723
92723
102723
112723
122723
132723
142723
152723
162723
172723
182723
192723
202723
212723
222723
232723
242722
252722
262722
272722
282722
292722
302722
312722

How December really feels in Yauco

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Yauco weather by month

How December compares with the rest of the year at a glance. December is the 8th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 22°154.4117.8
Feb27° / 22°194.511.47.7
Mar27° / 22°357.511.97.1
Apr27° / 23°5511.212.46.4
May28° / 24°9215.412.85.6
Jun29° / 24°5313.213.15.2
Jul29° / 25°6013.3135.1
Aug29° / 25°8517.412.64.5
Sep29° / 25°12720.112.14.3
Oct28° / 24°10619.511.64.6
Nov28° / 23°7313.111.26.0
Dec27° / 23°22510.97.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 20% of December, with mostly cloudy or overcast conditions the remaining 17%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17921
27921
38020
48020
58020
68119
78119
88119
98119
108218
118218
128119
138218
148218
158317
168218
178218
188218
198218
208317
218317
228317
238317
248416
258416
268515
278515
288614
298713
308713
318713

Chance of precipitation in December

Any precipitation

Yauco gets around 22 mm of rain over 5 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 16% and peaks near 24% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
124
223
322
422
521
620
720
819
919
1018
1117
1217
1316
1415
1515
1615
1714
1814
1914
2014
2114
2214
2313
2413
2513
2612
2712
2812
2912
3012
3112

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 67% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1065242
2065440
3065638
4065737
5065836
6066034
7066133
8066232
9066331
10076330
11076429
12076528
13076627
14086626
15086626
16186625
17186724
18186823
19186922
20186922
21187021
22187120
23187219
24187318
25187417
26187516
27187615
28187714
29197713
30097912
31098011

Wind in December

Winds average 15 km/h in December.

Across December, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 hours at the start of December to 10 h 54 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 6:47 AM to 7:03 AM, and sunset from 5:47 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.06:475:47
211.06:485:47
311.06:485:47
411.06:495:48
511.06:505:48
611.06:505:48
711.06:515:48
811.06:515:49
910.96:525:49
1010.96:535:49
1110.96:535:49
1210.96:545:50
1310.96:545:50
1410.96:555:51
1510.96:555:51
1610.96:565:51
1710.96:565:52
1810.96:575:52
1910.96:575:53
2010.96:585:53
2110.96:585:53
2210.96:595:54
2310.96:595:54
2410.97:005:55
2510.97:005:55
2610.97:015:56
2710.97:015:56
2810.97:015:57
2910.97:025:57
3010.97:025:58
3110.97:035:59

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.57 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.57 kWh/m² to a high of 6.69 kWh/m² in June across the year — December's 4.57 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in December

Hazard calendar for Yauco

In seasonPeak

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

Yauco sits in the Atlantic hurricane belt; the season peaks August–October.

Yauco's rainy season runs July–November, when most of the year's rain falls.

Yauco sees seasonal dust haze (July), heaviest in July.

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

Is December a good time to visit Yauco?

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

7.5
Sightseeing
3rd-best month of the year
7.8
Beach & pool
2nd-best month of the year

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

What to pack for Yauco in December

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

In December, Yauco sees daytime highs around 27°C and nights near 23°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Yauco in December

The nearest coast averages about 28°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 18 km away) is warmest in September at about 29°C and coldest in February near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Yauco in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yauco peaks around April 13 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 13UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Yauco 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 Yauco is worst in July — around 25 µg/m³ PM2.5 (moderate), about 4.8× the cleanest month (January, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1025 µg/m³Jan 15 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb7Good
Mar7Good
Apr8Good
May15Moderate
Jun25Moderate
Jul25Moderate
Aug20Moderate
Sep15Moderate
Oct15Moderate
Nov8Good
Dec5Good
Location & terrain

Where is Yauco?

Yauco sits at 18.0°N, 66.8°W, 40 m above sea level, in Puerto Rico. The nearest listed city is San Germán, 21 km away.

San GermánLa PargueraPonceMayagüezAreciboAguadillaBarcelonetaManatí

Topography around Yauco

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

Within 3 km, the terrain around Yauco has only modest variations in elevation — a maximum elevation change of 215 m around an average of 79 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,191 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,307 m.

The land around Yauco is covered by trees (56%) and artificial surfaces (25%) within 3 km, trees (60%) and water (21%) within 16 km, and water (60%) and trees (31%) within 80 km.

3 km
215 m
16 km
1,191 m
80 km
1,307 m
treesshrubsgrasslandcroplandartificial surfaceswatermangroves
December weather nearby: San Germán 21 km · La Parguera 22 km · Ponce 24 km · Mayagüez 36 km · Arecibo 51 km · Aguadilla 54 km · Barceloneta 57 km · Manatí 58 km

Puerto Rico travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 78% of US
price level, 2025
GDP per capita
$40,620
2025
Happiness
7.0 / 10
World Happiness, 2015
Safe drinking water
99%
of population, 2024
Homicide rate
14.6
per 100k, 2023
Income group
High
World Bank
Religion
Roman Catholic 56%Protestant 33%none 7%other 2%

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 Yauco (18.035°, -66.8499°, elevation 40 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).