Isulan weather in September

In September, Isulan sees average daytime highs of 31°C and overnight lows near 23°C, with 211 mm of rain across 25 wet days and about 12 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 3% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Isulan's 9th-clearest and 6th-windiest month. For the whole year in context, see Isulan's year-round climate.

Daytime high
31°
6th warmest
Overnight low
23°
6th coldest
Rainfall
211 mm
25 wet days
Daylight
12 hours
5:35 AM – 5:37 PM
Cloud cover
83%
9th clearest
Wind
3 km/h
6th windiest
Solar energy
5.17 kWh/m²
Travel score
2.7
out of 10

Isulan is municipality of the Philippines and capital of the province of Sultan Kudarat.

Density
187/km²
people per km²
Founded
1957

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 31°C through the month.

A typical September day in Isulan reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°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, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123

How September really feels in Isulan

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.

Isulan weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°1291711.73.8
Feb31° / 23°9914.111.83.7
Mar33° / 23°11215.8123.2
Apr33° / 24°12318.212.12.6
May33° / 24°22527.112.32.2
Jun31° / 24°2582712.42.4
Jul31° / 23°25626.612.32.7
Aug31° / 23°21425.112.22.8
Sep31° / 23°21125122.7
Oct31° / 23°23826.411.92.6
Nov31° / 23°17123.211.72.9
Dec31° / 23°1302011.63.3

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 10% of September, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11288
21288
31288
41288
51288
61288
71288
81288
91288
101288
111288
121288
131288
141288
151387
161387
171387
181387
191387
201486
211585
221585
231585
241585
251585
261585
271585
281585
291585
301585

Chance of precipitation in September

Any precipitation

Isulan gets around 211 mm of rain over 25 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 83% and peaks near 86% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
185
286
386
486
586
685
785
884
984
1083
1182
1282
1381
1481
1581
1680
1780
1880
1980
2080
2181
2281
2382
2482
2583
2683
2784
2884
2984
3085

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 (%)
10946
20946
30946
40946
50946
60946
71936
81936
91936
101936
111936
121936
131936
141936
151936
161936
171936
181936
191936
201936
211936
221936
231936
241936
251936
261936
271936
281936
290946
300937

Wind in September

Winds average 3 km/h in September.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 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 12 minutes over September. Sunrise moves from 5:37 AM to 5:32 AM, and sunset from 5:45 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:375:45
212.15:375:45
312.15:375:44
412.15:375:44
512.15:375:43
612.15:375:43
712.15:365:42
812.15:365:41
912.15:365:41
1012.15:365:40
1112.15:365:40
1212.15:365:39
1312.15:355:39
1412.05:355:38
1512.05:355:38
1612.05:355:37
1712.05:355:36
1812.05:345:36
1912.05:345:35
2012.05:345:35
2112.05:345:34
2212.05:345:34
2312.05:345:33
2412.05:335:33
2512.05:335:32
2612.05:335:31
2712.05:335:31
2812.05:335:30
2912.05:335:30
3011.95:325:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.17 kWh/m².

For context, solar energy here swings from a low near 4.69 kWh/m² to a high of 5.84 kWh/m² in April across the year — September's 5.17 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Isulan

In seasonPeak

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

Isulan 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 Isulan?

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

2.7
Sightseeing
7th-best month of the year
4.1
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Isulan.

What to pack for Isulan in September

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

In September, Isulan sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Isulan 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 60 km away) is warmest in May at about 30°C and coldest in February near 29°C.

The water stays above 20°C all year — warm enough for a swim any month.

28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May30Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Isulan 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 Isulan peaks around March 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 20UV 15Dec 12UV 10
UV index (midday)Level
Jan12Extreme
Feb13Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec10Very high

Air quality in Isulan 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 Isulan is worst in March — around 23 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1323 µg/m³Jun 2316 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb21Moderate
Mar23Moderate
Apr18Moderate
May17Moderate
Jun16Moderate
Jul16Moderate
Aug16Moderate
Sep19Moderate
Oct19Moderate
Nov18Moderate
Dec19Moderate
Location & terrain

Where is Isulan?

Isulan sits at 6.6°N, 124.6°E, 65 m above sea level, in Philippines. The nearest listed city is Laguilayan, 10 km away.

Topography around Isulan

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

Within 3 km, the terrain around Isulan has only modest variations in elevation — a maximum elevation change of 25 m around an average of 67 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,834 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,592 m.

The land around Isulan is covered by cropland (42%) and trees (40%) within 3 km, trees (50%) and cropland (42%) within 16 km, and trees (63%) within 80 km.

3 km
25 m
16 km
1,834 m
80 km
2,592 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Laguilayan 10 km · Tacurong 11 km · Norala 13 km · Sultan sa Barongis 19 km · Buluan 24 km · General Salipada K. Pendatun 25 km · Banga 30 km · Koronadal 30 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 Isulan (6.6294°, 124.605°, elevation 65 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).