Mayagüez weather in December

In December, Mayagüez sees average daytime highs of 27°C and overnight lows near 25°C, with 18 mm of rain across 4.6 wet days and about 10.9 hours of daylight. It is the 8th-warmest and 11th-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 70% of the time in December, and the air most often feels oppressive.

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 Mayagüez's 3rd-clearest and 1st-windiest month. For the whole year in context, see Mayagüez's year-round climate.

Daytime high
27°
8th warmest
Overnight low
25°
5th coldest
Rainfall
18 mm
4.6 wet days
Daylight
10 h 54 min
6:57 AM – 5:52 PM
Cloud cover
36%
3rd clearest
Wind
17 km/h
1st windiest
Solar energy
4.57 kWh/m²
Travel score
7.7
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 Mayagüez reaches about 27°C in the afternoon and slips back to 25°C overnight — a 3°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)
12725
22725
32725
42725
52725
62725
72725
82725
92725
102725
112725
122725
132725
142725
152725
162725
172725
182725
192725
202724
212724
222724
232724
242724
252724
262724
272724
282724
292724
302724
312724

How December really feels in Mayagüez

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.

Mayagüez weather by month

How December compares with the rest of the year at a glance. December is the 8th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 24°164.9117.8
Feb26° / 24°196.311.47.6
Mar26° / 24°289.111.97.2
Apr27° / 24°3610.512.46.7
May28° / 25°7014.812.85.7
Jun29° / 26°4713.213.15.1
Jul29° / 26°5114.4135.0
Aug29° / 27°6716.812.64.6
Sep29° / 26°9817.412.14.6
Oct28° / 26°7115.611.65.1
Nov28° / 25°5510.311.16.4
Dec27° / 25°184.610.97.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 70% 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 14%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18119
28317
38317
48317
58416
68416
78416
88416
98416
108416
118416
128515
138515
148515
158515
168515
178515
188515
198515
208515
218614
228614
238713
248812
258812
268812
278911
288911
298911
309010
31919

Chance of precipitation in December

Any precipitation

Mayagüez gets around 18 mm of rain over 4.6 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 14% and peaks near 19% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
119
219
318
417
517
616
716
815
915
1014
1114
1214
1313
1413
1513
1613
1713
1814
1914
2014
2114
2214
2314
2413
2513
2613
2712
2812
2912
3012
3112

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
122771
222969
332968
433067
533166
633265
733364
833364
933463
1033463
1133562
1233661
1333760
1433760
1533859
1633958
1734057
1834156
1934255
2044452
2144551
2244749
2344848
2445046
2545244
2645343
2745541
2845640
2945838
3045937
3146036

Wind in December

Winds average 17 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light 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 6:49 AM to 7:04 AM, and sunset from 5:48 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.06:495:48
211.06:495:48
311.06:505:48
411.06:515:48
511.06:515:49
611.06:525:49
710.96:525:49
810.96:535:49
910.96:535:50
1010.96:545:50
1110.96:555:50
1210.96:555:51
1310.96:565:51
1410.96:565:51
1510.96:575:52
1610.96:575:52
1710.96:585:53
1810.96:585:53
1910.96:595:53
2010.96:595:54
2110.97:005:54
2210.97:005:55
2310.97:015:55
2410.97:015:56
2510.97:025:56
2610.97:025:57
2710.97:035:57
2810.97:035:58
2910.97:035:58
3010.97:045:59
3110.97:045:59

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 April 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 Mayagüez

In seasonPeak

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

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

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

Mayagüez 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 Mayagüez?

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

7.7
Sightseeing
2nd-best month of the year
7.9
Beach & pool
1st-best month of the year

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

What to pack for Mayagüez in December

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

In December, Mayagüez sees daytime highs around 27°C and nights near 25°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Mayagüez 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 offshore 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
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Mayagüez 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 Mayagüez peaks around April 12 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 12UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar12Extreme
Apr13Extreme
May11Extreme
Jun12Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Mayagüez 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 Mayagüez is worst in July — around 25 µg/m³ PM2.5 (moderate), about 5.2× the cleanest month (January, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1025 µg/m³Jan 105 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb7Good
Mar7Good
Apr8Good
May15Moderate
Jun25Moderate
Jul25Moderate
Aug21Moderate
Sep15Moderate
Oct15Moderate
Nov8Good
Dec5Good
Location & terrain

Where is Mayagüez?

Mayagüez sits at 18.2°N, 67.1°W, 21 m above sea level, in Puerto Rico. The nearest listed city is San Germán, 17 km away.

San GermánAguadillaLa PargueraYaucoAreciboPonceBarcelonetaManatí

Topography around Mayagüez

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

Within 3 km, the terrain around Mayagüez has significant variations in elevation — a maximum elevation change of 265 m around an average of 42 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 766 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,307 m.

The land around Mayagüez is covered by trees (51%) and artificial surfaces (30%) within 3 km, trees (55%) and water (31%) within 16 km, and water (71%) and trees (23%) within 80 km.

3 km
265 m
16 km
766 m
80 km
1,307 m
treesgrasslandartificial surfaceswater
December weather nearby: San Germán 17 km · Aguadilla 25 km · La Parguera 27 km · Yauco 36 km · Arecibo 54 km · Ponce 58 km · Barceloneta 69 km · Manatí 73 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 Mayagüez (18.2011°, -67.1396°, elevation 21 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).