Guayama weather in January

In January, Guayama sees average daytime highs of 25°C and overnight lows near 23°C, with 48 mm of rain across 16.5 wet days and about 11 hours of daylight. It is the 11th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 63% of the time in January, and the air most often feels muggy.

Daylight stretches from about 10 h 54 min at the start of January to 11 h 12 min by month's end. Set against the rest of the year, January is Guayama's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Guayama's year-round climate.

Daytime high
25°
11th warmest
Overnight low
23°
3rd coldest
Rainfall
48 mm
16.5 wet days
Daylight
11 hours
7:03 AM – 6:05 PM
Cloud cover
38%
2nd clearest
Wind
17 km/h
3rd windiest
Solar energy
4.69 kWh/m²
Travel score
6.2
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical January day in Guayama reaches about 25°C in the afternoon and slips back to 23°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 26°C. Set against its neighbours, January runs on par with December and on par with February.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12623
22623
32623
42623
52623
62623
72623
82623
92523
102523
112523
122523
132523
142523
152523
162523
172523
182523
192523
202523
212523
222523
232523
242523
252523
262523
272523
282523
292523
302523
312523

How January really feels in Guayama

Once humidity and wind are folded in, January 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

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

Guayama weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 23°4816.5116.2
Feb25° / 23°3814.711.46.3
Mar26° / 23°4614.411.96.4
Apr26° / 23°6317.112.45.7
May27° / 24°11622.512.84.7
Jun28° / 25°9521.913.14.6
Jul28° / 25°11323134.6
Aug28° / 25°13024.712.64.2
Sep28° / 25°16724.912.13.9
Oct28° / 25°14625.111.64.2
Nov27° / 24°11321.211.24.9
Dec26° / 23°6017.710.95.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 63% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 26% of January, with mostly cloudy or overcast conditions the remaining 10%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18812
28812
38812
48812
58911
68911
78911
88911
99010
109010
119010
129010
139010
149010
159010
169010
179010
189010
199010
209010
219010
229010
239010
249010
259010
269010
279010
288911
298911
309010
319010

Chance of precipitation in January

Any precipitation

Guayama gets around 48 mm of rain over 16.5 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 54% and peaks near 57% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
156
256
356
457
557
657
757
857
957
1056
1156
1255
1355
1454
1554
1653
1753
1852
1952
2051
2151
2251
2350
2450
2550
2650
2751
2851
2951
3052
3152

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the muggy band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1033760
2033859
3033958
4034156
5034255
6034354
7034552
8024652
9024850
10024948
11025147
12025246
13125344
14125443
15125542
16135541
17135640
18135838
19135937
20145936
21146035
22156034
23156133
24166132
25166132
26176131
27176230
28186130
29086329
30086329
31086428

Wind in January

Winds average 17 km/h in January.

Across January, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light 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 January

DaylightNight

Daylight runs from about 10 h 54 min at the start of January to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over January. Sunrise moves from 6:59 AM to 7:02 AM, and sunset from 5:56 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.96:595:56
210.97:005:56
310.97:005:57
411.07:005:57
511.07:015:58
611.07:015:59
711.07:015:59
811.07:016:00
911.07:026:00
1011.07:026:01
1111.07:026:02
1211.07:026:02
1311.07:026:03
1411.07:036:03
1511.07:036:04
1611.07:036:05
1711.07:036:05
1811.07:036:06
1911.17:036:06
2011.17:036:07
2111.17:036:08
2211.17:036:08
2311.17:036:09
2411.17:036:09
2511.17:036:10
2611.17:036:11
2711.17:036:11
2811.27:036:12
2911.27:026:12
3011.27:026:13
3111.27:026:13

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.69 kWh/m².

For context, solar energy here swings from a low near 4.43 kWh/m² to a high of 6.54 kWh/m² in April across the year — January's 4.69 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
305.0Bright
315.0Bright
Planning a trip in January

Hazard calendar for Guayama

In seasonPeak

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

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

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

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

Is January a good time to visit Guayama?

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

6.2
Sightseeing
3rd-best month of the year
5.7
Beach & pool
3rd-best month of the year

January is a reasonable time to visit Guayama for sightseeing.

What to pack for Guayama in January

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

In January, Guayama sees daytime highs around 25°C and nights near 23°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

Sea temperature near Guayama in January

The nearest coast averages about 27°C in January — 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 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb26Warm
Mar26Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec28Warm

UV index in Guayama in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Guayama peaks around April 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Guayama in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Guayama is worst in July — around 25 µg/m³ PM2.5 (moderate), about 4.7× the cleanest month (January, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1125 µg/m³Jan 15 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb7Good
Mar7Good
Apr9Good
May14Moderate
Jun24Moderate
Jul25Moderate
Aug20Moderate
Sep15Moderate
Oct15Moderate
Nov8Good
Dec5Good
Location & terrain

Where is Guayama?

Guayama sits at 18.0°N, 66.1°W, 73 m above sea level, in Puerto Rico. The nearest listed city is Cayey, 15 km away.

CaguasHumacaoGuaynaboTrujillo AltoBayamónCarolinaCandelaria

Topography around Guayama

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

Within 3 km, the terrain around Guayama has significant variations in elevation — a maximum elevation change of 396 m around an average of 80 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 901 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,308 m.

The land around Guayama is covered by trees (56%) and artificial surfaces (25%) within 3 km, trees (46%) and water (38%) within 16 km, and water (58%) and trees (33%) within 80 km.

3 km
396 m
16 km
901 m
80 km
1,308 m
treesshrubsgrasslandcroplandartificial surfaceswatermangroves
January weather nearby: Cayey 15 km · Caguas 29 km · Humacao 35 km · Guaynabo 42 km · Trujillo Alto 43 km · Bayamón 46 km · Carolina 47 km · Candelaria 48 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 Guayama (17.9841°, -66.1138°, elevation 73 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).