Humacao weather in May

In May, Humacao sees average daytime highs of 27°C and overnight lows near 24°C, with 136 mm of rain across 24.2 wet days and about 12.8 hours of daylight. It is the 6th-warmest and 5th-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 18% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of May to 13 hours by month's end. Set against the rest of the year, May is Humacao's 11th-clearest and 9th-windiest month. For the whole year in context, see Humacao's year-round climate.

Daytime high
27°
6th warmest
Overnight low
24°
7th coldest
Rainfall
136 mm
24.2 wet days
Daylight
12 h 54 min
5:54 AM – 6:45 PM
Cloud cover
66%
11th clearest
Wind
13 km/h
9th windiest
Solar energy
6.37 kWh/m²
Travel score
4.4
out of 10

Humacao is historical and administrative center (seat) of Humacao, Puerto Rico.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

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

A typical May day in Humacao reaches about 27°C in the afternoon and slips back to 24°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 29°C. Set against its neighbours, May runs about 1°C warmer than April and about 1°C cooler than June.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12724
22724
32724
42724
52724
62724
72724
82724
92724
102724
112724
122724
132724
142724
152724
162724
172824
182824
192824
202824
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825
312825

How May really feels in Humacao

Once humidity and wind are folded in, May 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

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

Humacao weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 23°6019115.7
Feb26° / 23°4816.511.45.9
Mar26° / 23°5817.111.95.9
Apr27° / 23°8219.712.45.2
May27° / 24°13624.212.84.4
Jun28° / 25°10823.113.14.1
Jul28° / 25°13524.7134.0
Aug29° / 26°14626.712.63.6
Sep29° / 25°17025.512.13.5
Oct28° / 25°1602611.63.7
Nov27° / 24°14023.811.14.5
Dec26° / 24°7419.910.95.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 25% of May, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25743
35644
45446
55347
65248
75050
84951
94753
104654
114555
124357
134258
144159
154060
163961
173961
183862
193862
203862
213763
223763
233763
243763
253763
263763
273763
283763
293862
303961
313961

Chance of precipitation in May

Any precipitation

Humacao gets around 136 mm of rain over 24.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 78% and peaks near 80% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
172
272
373
474
575
675
776
877
977
1078
1178
1279
1379
1479
1579
1679
1779
1879
1978
2078
2178
2279
2379
2479
2579
2679
2779
2880
2980
3080
3180

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the oppressive band about 85% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1110863
2110863
309883
408893
508893
607903
707894
806904
906895
1005896
1105887
1204888
1304888
1403889
15038710
16028711
17028612
18028612
19018613
20018514
21018514
22018415
23018316
24018217
25018118
26018118
27008119
28008020
29007921
30007921
31007822

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 13 km/h on the calmest days to 14 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
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 36 min at the start of May to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over May. Sunrise moves from 6:01 AM to 5:51 AM, and sunset from 6:40 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:016:40
212.76:006:40
312.76:006:41
412.75:596:41
512.75:596:41
612.75:586:42
712.75:586:42
812.75:576:42
912.85:576:43
1012.85:566:43
1112.85:566:43
1212.85:566:44
1312.85:556:44
1412.85:556:44
1512.85:546:45
1612.95:546:45
1712.95:546:45
1812.95:536:46
1912.95:536:46
2012.95:536:47
2112.95:536:47
2212.95:526:47
2312.95:526:48
2412.95:526:48
2512.95:526:48
2613.05:516:49
2713.05:516:49
2813.05:516:50
2913.05:516:50
3013.05:516:50
3113.05:516:51

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.37 kWh/m².

For context, solar energy here swings from a low near 4.4 kWh/m² to a high of 6.54 kWh/m² in April across the year — May's 6.37 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.4Intense
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
316.4Intense
Planning a trip in May

Hazard calendar for Humacao

In seasonPeak

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

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

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

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

Is May a good time to visit Humacao?

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

4.4
Sightseeing
7th-best month of the year
4.6
Beach & pool
9th-best month of the year

May is a reasonable time to visit Humacao for sightseeing.

What to pack for Humacao in May

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

In May, Humacao sees daytime highs around 27°C and nights near 24°C. Pack light clothes, rain gear and sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Humacao in May

The nearest coast averages about 28°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 km away) 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
Dec27Warm

UV index in Humacao in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Humacao 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 Humacao in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Humacao 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 Humacao?

Humacao sits at 18.1°N, 65.8°W, 22 m above sea level, in Puerto Rico. The nearest listed city is Caguas, 25 km away.

CaguasFajardoCarolinaTrujillo AltoGuayamaCayeyGuaynaboBayamón

Topography around Humacao

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

Within 3 km, the terrain around Humacao has significant variations in elevation — a maximum elevation change of 271 m around an average of 68 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,052 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,298 m.

The land around Humacao is covered by trees (65%) and artificial surfaces (24%) within 3 km, trees (55%) and water (24%) within 16 km, and water (69%) and trees (24%) within 80 km.

3 km
271 m
16 km
1,052 m
80 km
1,298 m
treesgrasslandartificial surfaceswaterwetland
May weather nearby: Caguas 25 km · Fajardo 27 km · Carolina 29 km · Trujillo Alto 30 km · Guayama 35 km · Cayey 36 km · Guaynabo 38 km · Bayamón 44 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 Humacao (18.1497°, -65.8274°, elevation 22 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).