Bintulu weather in September

In September, Bintulu sees average daytime highs of 30°C and overnight lows near 25°C, with 213 mm of rain across 23.8 wet days and about 12 hours of daylight. It is the 6th-warmest and 5th-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 2% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Bintulu's 7th-clearest and 8th-windiest month. For the whole year in context, see Bintulu's year-round climate.

Daytime high
30°
6th warmest
Overnight low
25°
7th coldest
Rainfall
213 mm
23.8 wet days
Daylight
12 hours
6:22 AM – 6:23 PM
Cloud cover
84%
7th clearest
Wind
7 km/h
8th windiest
Solar energy
5.24 kWh/m²
Travel score
3.1
out of 10

Bintulu is town on the island of Borneo in the central region of Sarawak, Malaysia.

Founded
1862

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 Bintulu reaches about 30°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°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)
13025
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293024
303024

How September really feels in Bintulu

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.

Bintulu weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°29826.111.83.2
Feb29° / 24°19221.611.93.5
Mar30° / 25°16522.6123.4
Apr30° / 25°18824.212.13.0
May31° / 25°18322.812.13.1
Jun31° / 25°17720.412.23.3
Jul31° / 25°17019.612.23.4
Aug31° / 25°19621.112.13.3
Sep30° / 25°21323.8123.1
Oct30° / 24°27427.311.92.9
Nov30° / 24°29128.411.92.7
Dec29° / 24°34828.811.82.8

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 9% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11387
21288
31288
41288
51288
61288
71288
81288
91288
101189
111189
121189
131189
141189
151189
161189
171189
181189
191189
201189
211189
221090
231090
241090
251090
261090
27991
28991
29892
30892

Chance of precipitation in September

Any precipitation

Bintulu gets around 213 mm of rain over 23.8 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 79% and peaks near 83% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
178
278
379
479
579
679
779
879
979
1079
1179
1279
1379
1478
1578
1678
1778
1878
1978
2078
2178
2279
2379
2480
2580
2681
2781
2882
2982
3083

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 (%)
15149
25248
35248
45248
55248
65347
75248
85248
95248
105248
115248
125248
135149
145149
155050
164951
174951
184852
194753
204753
214654
224654
234753
244753
254753
264852
274951
284951
295050
305050

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 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
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 6:26 AM to 6:18 AM, and sunset from 6:29 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:266:29
212.16:266:29
312.16:256:29
412.16:256:28
512.06:256:28
612.06:246:27
712.06:246:27
812.06:246:26
912.06:246:26
1012.06:236:25
1112.06:236:25
1212.06:236:25
1312.06:236:24
1412.06:226:24
1512.06:226:23
1612.06:226:23
1712.06:216:22
1812.06:216:22
1912.06:216:21
2012.06:216:21
2112.06:206:20
2212.06:206:20
2312.06:206:19
2412.06:196:19
2512.06:196:19
2612.06:196:18
2712.06:196:18
2812.06:186:17
2912.06:186:17
3012.06:186:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.24 kWh/m².

For context, solar energy here swings from a low near 4.22 kWh/m² to a high of 5.27 kWh/m² in March across the year — September's 5.24 kWh/m² sits near the top of that range.

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
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Bintulu

In seasonPeak

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

Bintulu 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 Bintulu?

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

3.1
Sightseeing
7th-best month of the year
4.3
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Bintulu.

What to pack for Bintulu in September

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

In September, Bintulu sees daytime highs around 30°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 Bintulu in September

The nearest coast averages about 30°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 18 km away) is warmest in May at about 30°C and coldest in February near 28°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
Jan28Tropical
Feb28Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov29Tropical
Dec29Tropical

UV index in Bintulu 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 Bintulu peaks around March 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 24UV 15Nov 21UV 11
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr15Extreme
May14Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct14Extreme
Nov11Extreme
Dec12Extreme

Air quality in Bintulu 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 Bintulu is worst in September — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodSep 1518 µg/m³Dec 149 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb13Moderate
Mar12Moderate
Apr12Moderate
May11Good
Jun12Good
Jul13Moderate
Aug15Moderate
Sep19Moderate
Oct13Moderate
Nov9Good
Dec9Good
Location & terrain

Where is Bintulu?

Bintulu sits at 3.2°N, 113.0°E, 8 m above sea level, in Malaysia. The nearest listed city is Sebauh, 27 km away.

Kapit

Topography around Bintulu

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

Within 3 km, the terrain around Bintulu has only modest variations in elevation — a maximum elevation change of 65 m around an average of 10 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 182 m; within 80 km, large variations in elevation — a maximum elevation change of 1,062 m.

The land around Bintulu is covered by trees (40%) and water (26%) within 3 km, trees (54%) and water (38%) within 16 km, and trees (70%) and water (29%) within 80 km.

3 km
65 m
16 km
182 m
80 km
1,062 m
treesgrasslandartificial surfacesbare terrainwater
September weather nearby: Sebauh 27 km · Tatau 38 km · Belaga 98 km · Selangau 106 km · Niah 108 km · Mukah 109 km · Dalat 119 km · Kapit 131 km

Malaysia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / G / M
230 V · 50 Hz
Prices
≈ 32% of US
price level, 2025
GDP per capita
$13,125
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
95%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
22.5
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 581
Religion
Muslim 64%Buddhist 19%Christian 9%Hindu 6%

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 Bintulu (3.1667°, 113.0333°, elevation 8 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).