San Antonio weather in September

In September, San Antonio sees average daytime highs of 29°C and overnight lows near 26°C, with 434 mm of rain across 27.8 wet days and about 12.1 hours of daylight. It is the 11th-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 3% 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 Antonio's 10th-clearest and 6th-windiest month. For the whole year in context, see San Antonio's year-round climate.

Daytime high
29°
11th warmest
Overnight low
26°
7th coldest
Rainfall
434 mm
27.8 wet days
Daylight
12 h 06 min
5:52 AM – 5:56 PM
Cloud cover
88%
10th clearest
Wind
9 km/h
6th windiest
Solar energy
4.31 kWh/m²
Travel score
3.1
out of 10

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

Density
205/km²
people per km²
Founded
1849

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 Antonio reaches about 29°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12826
22826
32926
42926
52926
62926
72926
82926
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192926
202926
212926
222926
232926
242926
252926
262926
272926
282926
292926
302926

How September really feels in San Antonio

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 Antonio weather by month

How September compares with the rest of the year at a glance. September is the 11th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°132.711.26.4
Feb30° / 24°192.911.56.2
Mar31° / 25°295.111.95.5
Apr31° / 26°4410.112.34.5
May31° / 27°21622.412.73.3
Jun30° / 26°4022712.92.9
Jul29° / 26°61729.612.83.0
Aug28° / 26°62529.312.53.1
Sep29° / 26°43427.812.13.1
Oct30° / 26°22720.511.73.8
Nov30° / 25°8810.211.35.0
Dec30° / 25°596.511.15.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 91%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3595
4595
5595
6595
7595
8595
9694
10694
11694
12694
13694
14793
15793
16892
17892
18991
191090
201090
211189
221189
231189
241288
251288
261387
271486
281585
291684
301783

Chance of precipitation in September

Any precipitation

San Antonio gets around 434 mm of rain over 27.8 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 93% and peaks near 95% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
192
291
392
492
592
692
792
893
993
1094
1194
1294
1395
1495
1595
1695
1795
1895
1994
2094
2193
2293
2393
2492
2591
2691
2790
2889
2988
3087

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 88% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
11189
21189
31189
41189
51189
61189
71189
81090
91090
101090
111090
121090
131090
141090
151090
161090
171090
181189
191189
201189
211288
221288
231387
241387
251486
261585
271684
281684
291783
301882

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 5:51 AM to 5:53 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)
112.35:516:08
212.35:516:07
312.35:516:07
412.35:516:06
512.25:516:05
612.25:516:04
712.25:516:04
812.25:516:03
912.25:516:02
1012.25:516:01
1112.25:516:00
1212.15:516:00
1312.15:515:59
1412.15:515:58
1512.15:515:57
1612.15:525:56
1712.15:525:56
1812.15:525:55
1912.05:525:54
2012.05:525:53
2112.05:525:52
2212.05:525:52
2312.05:525:51
2412.05:525:50
2512.05:525:49
2611.95:525:48
2711.95:525:48
2811.95:525:47
2911.95:525:46
3011.95:535:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.31 kWh/m².

For context, solar energy here swings from a low near 4.16 kWh/m² to a high of 6.53 kWh/m² in April across the year — September's 4.31 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.5Bright
284.5Bright
294.5Bright
304.6Bright
Planning a trip in September

Hazard calendar for San Antonio

In seasonPeak

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

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

San Antonio'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 Antonio?

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

3.1
Sightseeing
9th-best month of the year
3.9
Beach & pool
10th-best month of the year

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

What to pack for San Antonio in September

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

In September, San Antonio sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

Sea temperature near San Antonio 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 Antonio 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 Antonio 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 Antonio 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 Antonio 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 Antonio?

San Antonio sits at 14.9°N, 120.1°E, 16 m above sea level, in Philippines. The nearest listed city is San Narciso, 8.0 km away.

Topography around San Antonio

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

Within 3 km, the terrain around San Antonio has significant variations in elevation — a maximum elevation change of 398 m around an average of 40 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,081 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,021 m.

The land around San Antonio is covered by trees (50%), grassland (22%) and cropland (21%) within 3 km, water (42%), trees (23%) and grassland (20%) within 16 km, and water (47%) and trees (32%) within 80 km.

3 km
398 m
16 km
1,081 m
80 km
2,021 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: San Narciso 8.0 km · San Marcelino 8.0 km · Castillejos 12 km · Subic 17 km · Olongapo 25 km · Morong 35 km · Botolan 39 km · Dinalupihan 40 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 Antonio (14.9466°, 120.0867°, elevation 16 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).