Ilagan weather in September

In September, Ilagan sees average daytime highs of 30°C and overnight lows near 23°C, with 301 mm of rain across 26.9 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 4% of the time in September, and the air most often feels oppressive.

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 Ilagan's 10th-clearest and 12th-windiest month. For the whole year in context, see Ilagan's year-round climate.

Daytime high
30°
6th warmest
Overnight low
23°
9th coldest
Rainfall
301 mm
26.9 wet days
Daylight
12 h 06 min
5:44 AM – 5:50 PM
Cloud cover
84%
10th clearest
Wind
4 km/h
12th windiest
Solar energy
4.86 kWh/m²
Travel score
2.9
out of 10

Ilagan is city of the Philippines and capital of the province of Isabela.

Density
141/km²
people per km²
Founded
1686

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 30°C through the month.

A typical September day in Ilagan reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
282923
292923
302923

How September really feels in Ilagan

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.

Ilagan weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 19°11920.411.15.1
Feb26° / 19°10618.411.45.1
Mar28° / 20°10217.911.95.2
Apr30° / 22°11617.112.44.1
May31° / 23°23324.112.82.9
Jun32° / 23°23025.9132.5
Jul31° / 23°36428.712.92.6
Aug30° / 23°32928.312.62.6
Sep30° / 23°30126.912.12.9
Oct28° / 22°26725.611.63.7
Nov27° / 21°2632411.24.2
Dec25° / 20°31324.8114.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 83%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31585
41585
51585
61585
71585
81585
91684
101783
111783
121684
131684
141684
151684
161684
171783
181783
191783
201783
211783
221783
231882
241882
251981
262080
272080
282080
292080
302179

Chance of precipitation in September

Any precipitation

Ilagan gets around 301 mm of rain over 26.9 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 89% and peaks near 91% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
191
291
391
491
591
691
791
891
991
1091
1190
1290
1390
1489
1589
1689
1788
1888
1988
2088
2188
2288
2388
2488
2588
2687
2787
2887
2987
3087

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 93% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
108911
209010
309010
409010
50919
60919
70928
80928
90937
100937
110937
120946
130946
140946
150955
160955
170955
181945
191945
201945
211954
221954
232944
242944
252944
262953
273943
283943
294942
304942

Wind in September

Winds average 4 km/h in September, the calmest month.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:42 AM to 5:46 AM, and sunset from 6:02 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:426:02
212.35:426:02
312.35:426:01
412.35:426:00
512.35:435:59
612.35:435:58
712.25:435:57
812.25:435:57
912.25:435:56
1012.25:435:55
1112.25:435:54
1212.25:435:53
1312.15:445:52
1412.15:445:51
1512.15:445:50
1612.15:445:50
1712.15:445:49
1812.15:445:48
1912.05:445:47
2012.05:445:46
2112.05:455:45
2212.05:455:44
2312.05:455:44
2412.05:455:43
2511.95:455:42
2611.95:455:41
2711.95:455:40
2811.95:465:39
2911.95:465:38
3011.95:465:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.86 kWh/m².

For context, solar energy here swings from a low near 2.54 kWh/m² to a high of 5.99 kWh/m² in June across the year — September's 4.86 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
104.9Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Hazard calendar for Ilagan

In seasonPeak

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

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

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

Is September a good time to visit Ilagan?

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

2.9
Sightseeing
8th-best month of the year
4.0
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Ilagan.

What to pack for Ilagan in September

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

In September, Ilagan sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Ilagan 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 at the nearest coast (about 57 km away) is warmest in June at about 30°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°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar27Warm
Apr28Tropical
May29Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct29Tropical
Nov28Warm
Dec27Warm

UV index in Ilagan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ilagan peaks around August 19 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 19UV 14Dec 11UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar12Extreme
Apr13Extreme
May13Extreme
Jun13Extreme
Jul12Extreme
Aug14Extreme
Sep13Extreme
Oct10Extreme
Nov8Very high
Dec8Very high
Location & terrain

Where is Ilagan?

Ilagan sits at 17.1°N, 121.9°E, 55 m above sea level, in Philippines. The nearest listed city is Roxas, 29 km away.

Topography around Ilagan

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

Within 3 km, the terrain around Ilagan has only modest variations in elevation — a maximum elevation change of 85 m around an average of 36 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 722 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,277 m.

The land around Ilagan is covered by cropland (63%) within 3 km, cropland (57%) and trees (32%) within 16 km, and trees (55%) and cropland (23%) within 80 km.

3 km
85 m
16 km
722 m
80 km
2,277 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Roxas 29 km · Cabagan 34 km · San Mateo 44 km · Alicia 46 km · Tuguegarao 55 km · Ramon 55 km · Tabuk 58 km · Solana 60 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 Ilagan (17.1485°, 121.8892°, elevation 55 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).