San Marcelino weather in May

In May, San Marcelino sees average daytime highs of 31°C and overnight lows near 25°C, with 224 mm of rain across 23.5 wet days and about 12.7 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 32°C in the first days to 30°C by the end. The sky is clear or mostly clear about 15% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 30 min at the start of May to 12 h 48 min by month's end. Set against the rest of the year, May is San Marcelino's 7th-clearest and 12th-windiest month. For the whole year in context, see San Marcelino's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
25°
12th coldest
Rainfall
224 mm
23.5 wet days
Daylight
12 h 42 min
5:35 AM – 6:16 PM
Cloud cover
73%
7th clearest
Wind
6 km/h
12th windiest
Solar energy
5.62 kWh/m²
Travel score
2.9
out of 10

San Marcelino is municipality of the Philippines in the province of Zambales.

Density
45/km²
people per km²
Founded
1843

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 32°C in the first days to 30°C by the end.

A typical May day in San Marcelino reaches about 31°C in the afternoon and slips back to 25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43225
53225
63225
73225
83225
93225
103225
113225
123225
133225
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263125
273125
283025
293025
303025
313025

How May really feels in San Marcelino

Once humidity and wind are folded in, May averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

San Marcelino weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°24511.26.2
Feb30° / 21°294.711.55.8
Mar31° / 22°437.611.94.9
Apr32° / 24°5612.212.33.9
May31° / 25°22423.512.72.9
Jun30° / 24°36528.312.92.7
Jul29° / 24°54430.312.82.8
Aug28° / 24°5233012.53.0
Sep29° / 24°40528.712.12.9
Oct30° / 24°24122.811.73.5
Nov30° / 23°10513.911.34.7
Dec29° / 22°788.911.15.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 68%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25842
35545
45347
55149
64951
74753
84555
94258
104159
113961
123862
133664
143466
153367
163169
172971
182773
192575
202278
212179
221981
231981
241783
251684
261684
271684
281486
291486
301486
311387

Chance of precipitation in May

Any precipitation

San Marcelino gets around 224 mm of rain over 23.5 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 75% and peaks near 90% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
152
254
356
457
559
661
762
864
966
1068
1169
1271
1373
1475
1576
1678
1780
1881
1982
2084
2185
2286
2387
2488
2588
2689
2789
2890
2990
3090
3190

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the miserable band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
146531
236433
336334
436136
526038
625840
725741
815643
915445
1015247
1115049
1204951
1304654
1404456
1504258
1604060
1703862
1803565
1903367
2003169
2103070
2202872
2302674
2402575
2502476
2602377
2702278
2802278
2902179
3002179
3102179

Wind in May

Winds average 6 km/h in May, the calmest month.

Across May, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over May. Sunrise moves from 5:41 AM to 5:32 AM, and sunset from 6:12 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:416:12
212.55:406:13
312.65:406:13
412.65:396:13
512.65:396:13
612.65:386:14
712.65:386:14
812.65:386:14
912.65:376:14
1012.65:376:15
1112.65:366:15
1212.75:366:15
1312.75:366:16
1412.75:356:16
1512.75:356:16
1612.75:356:16
1712.75:356:17
1812.75:346:17
1912.75:346:17
2012.75:346:18
2112.75:346:18
2212.75:336:18
2312.85:336:19
2412.85:336:19
2512.85:336:19
2612.85:336:20
2712.85:336:20
2812.85:336:20
2912.85:326:21
3012.85:326:21
3112.85:326:21

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.62 kWh/m².

For context, solar energy here swings from a low near 4.06 kWh/m² to a high of 6.36 kWh/m² in April across the year — May's 5.62 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.1Intense
56.1Intense
66.0Intense
76.0Intense
86.0Bright
95.9Bright
105.9Bright
115.8Bright
125.8Bright
135.7Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.1Bright
Planning a trip in May

Hazard calendar for San Marcelino

In seasonPeak

In May, San Marcelino sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

San Marcelino sits in the Pacific typhoon belt; the season peaks July–October.

San Marcelino's monsoon runs June–September, when most of the year's rain falls.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit San Marcelino?

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

2.9
Sightseeing
9th-best month of the year
4.5
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in San Marcelino.

What to pack for San Marcelino in May

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

In May, San Marcelino sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near San Marcelino in May

The nearest coast averages about 30°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in May at about 30°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°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar28Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in San Marcelino 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 San Marcelino peaks around August 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 11 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 17UV 14Dec 11UV 8
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in San Marcelino 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 San Marcelino is worst in November — around 30 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateNov 1530 µg/m³Aug 1421 µg/m³
PM2.5 (µg/m³)Level
Jan27Moderate
Feb26Moderate
Mar29Moderate
Apr28Moderate
May23Moderate
Jun22Moderate
Jul21Moderate
Aug21Moderate
Sep22Moderate
Oct29Moderate
Nov30Moderate
Dec29Moderate
Location & terrain

Where is San Marcelino?

San Marcelino sits at 15.0°N, 120.2°E, 45 m above sea level, in Philippines. The nearest listed city is Castillejos, 6.0 km away.

Topography around San Marcelino

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

Within 3 km, the terrain around San Marcelino has only modest variations in elevation — a maximum elevation change of 79 m around an average of 37 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,082 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,021 m.

The land around San Marcelino is covered by cropland (45%) and trees (37%) within 3 km, trees (42%) and grassland (25%) within 16 km, and water (45%) and trees (31%) within 80 km.

3 km
79 m
16 km
1,082 m
80 km
2,021 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Castillejos 6.0 km · San Antonio 8.0 km · San Narciso 9.0 km · Subic 13 km · Olongapo 21 km · Dinalupihan 33 km · Morong 35 km · Botolan 38 km

Philippines travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
230 V · 60 Hz
Prices
≈ 33% of US
price level, 2025
GDP per capita
$4,171
2025
Happiness
6.2 / 10
World Happiness, 2025
Safe drinking water
48%
of population, 2024
Homicide rate
4.3
per 100k, 2023
Road deaths
12
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 569
Religion
Roman Catholic 79%other 8%Muslim 6%other Christian 4%

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 San Marcelino (14.9742°, 120.1573°, elevation 45 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).