Puerto Rico weather in December

In December, Puerto Rico sees average daytime highs of 31°C and overnight lows near 20°C, with 181 mm of rain across 14 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 38% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 36 min at the start of December to 13 h 42 min by month's end. Set against the rest of the year, December is Puerto Rico's 9th-clearest and 8th-windiest month. For the whole year in context, see Puerto Rico's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
20°
10th coldest
Rainfall
181 mm
14 wet days
Daylight
13 h 42 min
5:46 AM – 7:27 PM
Cloud cover
56%
9th clearest
Wind
8 km/h
8th windiest
Solar energy
6.44 kWh/m²
Travel score
4.1
out of 10

Puerto Rico is capital city of the Libertador General San Martín Department, in the Misiones Province of Argentina.

Founded
1919

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 31°C through the month.

A typical December day in Puerto Rico reaches about 31°C in the afternoon and slips back to 20°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 35°C. Set against its neighbours, December runs about 2°C warmer than November and on par with January.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13119
23119
33119
43119
53119
63119
73120
83120
93120
103120
113120
123120
133120
143120
153120
163120
173120
183120
193120
203120
213120
223120
233121
243121
253121
263221
273221
283221
293221
303221
313221

How December really feels in Puerto Rico

Once humidity and wind are folded in, December averages 27 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
27
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.

Puerto Rico weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 21°15114.913.53.7
Feb31° / 21°15414.412.94.0
Mar30° / 20°13711.912.24.9
Apr27° / 17°1419.711.46.5
May23° / 14°1629.210.77.0
Jun21° / 12°1549.110.36.7
Jul21° / 11°1259.110.56.9
Aug24° / 13°907.611.17.6
Sep26° / 15°15310.211.86.8
Oct28° / 17°20613.212.65.8
Nov30° / 18°16711.413.35.1
Dec31° / 20°1811413.74.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 46%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35446
45446
55347
65446
75446
85446
95545
105446
115446
125545
135545
145545
155545
165644
175644
185644
195545
205545
215545
225446
235347
245347
255248
265149
275050
285050
295050
305149
315149

Chance of precipitation in December

Any precipitation

Puerto Rico gets around 181 mm of rain over 14 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 45% and peaks near 49% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
140
241
341
441
542
642
742
842
942
1043
1143
1243
1343
1444
1544
1644
1745
1845
1945
2045
2146
2247
2347
2448
2548
2649
2749
2849
2949
3049
3149

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 37% of days. Sticky, muggy-or-worse air turns up on roughly 73% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
15112140230
25112040240
35102040250
45102040260
5591939270
6591939280
7591939290
8491938300
9481938310
10481838310
11481837320
12481837330
13481837340
14381736350
15381736360
16371736370
17271735380
18271635391
19271634401
20271534411
21271533421
22161433432
23161432452
24161431462
25161330473
26151330483
27151329484
28151329494
29151228494
30151228505
31151228505

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 8 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
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 36 min at the start of December to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:43 AM to 5:53 AM, and sunset from 7:17 PM to 7:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:437:17
213.65:437:17
313.65:437:18
413.65:437:19
513.65:437:20
613.65:437:20
713.65:447:21
813.65:447:22
913.65:447:22
1013.65:447:23
1113.75:447:24
1213.75:457:24
1313.75:457:25
1413.75:457:25
1513.75:467:26
1613.75:467:27
1713.75:467:27
1813.75:477:28
1913.75:477:28
2013.75:487:29
2113.75:487:29
2213.75:487:30
2313.75:497:30
2413.75:497:31
2513.75:507:31
2613.75:507:31
2713.75:517:32
2813.75:527:32
2913.75:527:33
3013.75:537:33
3113.75:537:33

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.44 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.69 kWh/m² to a high of 6.44 kWh/m² in December across the year — December's 6.44 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.5Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
316.4Intense
Planning a trip in December

Is December a good time to visit Puerto Rico?

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

4.1
Sightseeing
10th-best month of the year
6.1
Beach & pool
7th-best month of the year

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

What to pack for Puerto Rico in December

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

In December, Puerto Rico sees daytime highs around 31°C and nights near 20°C. Pack light clothes, rain gear and sun protection. About 14 days see rain.

light clothesrain gearsun protection

UV index in Puerto Rico in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Puerto Rico peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 18UV 14Jun 22UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr8Very high
May6High
Jun4Moderate
Jul4Moderate
Aug6High
Sep8Very high
Oct8Very high
Nov11Extreme
Dec13Extreme

Air quality in Puerto Rico 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 Puerto Rico is worst in September — around 19 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1318 µg/m³Dec 177 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar7Good
Apr8Good
May7Good
Jun7Good
Jul10Good
Aug16Moderate
Sep19Moderate
Oct11Good
Nov8Good
Dec7Good
Location & terrain

Where is Puerto Rico?

Puerto Rico sits at 26.8°S, 55.0°W, 188 m above sea level, in Argentina. The nearest listed city is Jardín América, 33 km away.

Topography around Puerto Rico

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

Within 3 km, the terrain around Puerto Rico has only modest variations in elevation — a maximum elevation change of 161 m around an average of 158 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 250 m; within 80 km, significant variations in elevation — a maximum elevation change of 550 m.

The land around Puerto Rico is covered by trees (52%) and grassland (24%) within 3 km, trees (59%) and cropland (21%) within 16 km, and trees (65%) and cropland (24%) within 80 km.

3 km
161 m
16 km
250 m
80 km
550 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Jardín América 33 km · Montecarlo 37 km · Eldorado 60 km · Oberá 76 km · Trinidad 77 km · San Vicente 91 km · San Pedro 93 km · Leandro N. Alem 93 km

Argentina travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / I
220 V · 50 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$14,898
2025
Happiness
6.4 / 10
World Happiness, 2025
Homicide rate
4.5
per 100k, 2023
Road deaths
14.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 575
Religion
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus 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 Puerto Rico (-26.8089°, -55.0215°, elevation 188 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).