San Marcelino weather in September

In September, San Marcelino sees average daytime highs of 29°C and overnight lows near 24°C, with 405 mm of rain across 28.7 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is San Marcelino's 10th-clearest and 10th-windiest month. For the whole year in context, see San Marcelino's year-round climate.

Daytime high
29°
10th warmest
Overnight low
24°
8th coldest
Rainfall
405 mm
28.7 wet days
Daylight
12 h 06 min
5:51 AM – 5:56 PM
Cloud cover
90%
10th clearest
Wind
6 km/h
10th windiest
Solar energy
4.18 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 September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in San Marcelino reaches about 29°C in the afternoon and slips back to 24°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62924
72924
82924
92924
102924
112924
122924
132924
142924
152924
162924
172924
182924
192924
202924
212924
222924
232924
242924
252924
262924
272924
282924
292924
302924

How September really feels in San Marcelino

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

San Marcelino weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 3rd-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1496
2496
3496
4496
5496
6496
7496
8496
9496
10496
11496
12496
13496
14595
15595
16595
17694
18694
19694
20694
21892
22892
23892
24892
251090
261090
271090
281189
291288
301387

Chance of precipitation in September

Any precipitation

San Marcelino gets around 405 mm of rain over 28.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 96% and peaks near 97% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
195
295
395
495
595
695
796
896
996
1096
1197
1297
1397
1497
1597
1697
1797
1897
1997
2097
2196
2296
2396
2495
2595
2694
2794
2893
2993
3092

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14654
24654
34654
44654
54753
64753
74852
84852
94951
104951
115050
125050
135149
145149
155149
165149
175149
185149
195149
205050
215050
225050
235050
245050
255050
265050
275149
285149
295248
305347

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 5:50 AM to 5:52 AM, and sunset from 6:08 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:506:08
212.35:506:07
312.35:506:06
412.35:506:06
512.25:516:05
612.25:516:04
712.25:516:03
812.25:516:03
912.25:516:02
1012.25:516:01
1112.25:516:00
1212.15:515:59
1312.15:515:59
1412.15:515:58
1512.15:515:57
1612.15:515:56
1712.15:515:55
1812.15:515:55
1912.05:515:54
2012.05:515:53
2112.05:525:52
2212.05:525:51
2312.05:525:51
2412.05:525:50
2512.05:525:49
2611.95:525:48
2711.95:525:47
2811.95:525:47
2911.95:525:46
3011.95:525:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.18 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 — September's 4.18 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for San Marcelino

In seasonPeak

In September, San Marcelino sits inside its pacific typhoon and monsoon 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 September a good time to visit San Marcelino?

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

2.9
Sightseeing
9th-best month of the year
3.7
Beach & pool
10th-best month of the year

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

What to pack for San Marcelino in September

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

In September, San Marcelino sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near San Marcelino in September

The nearest coast averages about 29°C in September — 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 September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September 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
September 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).