Kuala Belait weather in September

In September, Kuala Belait sees average daytime highs of 30°C and overnight lows near 25°C, with 199 mm of rain across 23.6 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 30°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 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Kuala Belait's 8th-clearest and 7th-windiest month. For the whole year in context, see Kuala Belait's year-round climate.

Daytime high
30°
6th warmest
Overnight low
25°
7th coldest
Rainfall
199 mm
23.6 wet days
Daylight
12 hours
6:17 AM – 6:18 PM
Cloud cover
83%
8th clearest
Wind
8 km/h
7th windiest
Solar energy
5.6 kWh/m²
Travel score
3.2
out of 10

Kuala Belait is town in Brunei.

Founded
1929

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 Kuala Belait reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°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)
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
293025
303025

How September really feels in Kuala Belait

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.

Kuala Belait 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
Jan29° / 25°22724.511.83.5
Feb29° / 25°15120.111.93.8
Mar29° / 25°13423123.6
Apr30° / 25°1762512.13.1
May30° / 25°18923.412.23.2
Jun30° / 25°20621.112.33.5
Jul30° / 25°18720.812.23.6
Aug30° / 25°19221.712.13.5
Sep30° / 25°19923.6123.2
Oct29° / 25°26927.811.93.0
Nov29° / 25°28428.511.82.8
Dec29° / 25°28728.111.73.0

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 9% of September, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21486
31486
41486
51486
61486
71387
81387
91288
101288
111288
121189
131090
141090
151090
161090
171090
181090
191189
201189
211189
221189
231189
241189
251189
261189
271189
281189
291189
301090

Chance of precipitation in September

Any precipitation

Kuala Belait gets around 199 mm of rain over 23.6 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 86% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
177
277
378
478
578
678
778
877
977
1077
1177
1277
1377
1477
1577
1677
1777
1877
1978
2078
2179
2280
2380
2481
2582
2683
2784
2884
2985
3086

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 56% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14456
24555
34654
44654
54753
64753
74753
84654
94654
104654
114654
124654
134654
144555
154555
164456
174357
184258
194258
204159
214159
224159
234159
244159
254258
264258
274357
284456
294456
304555

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 6:20 AM to 6:13 AM, and sunset from 6:25 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:206:25
212.16:206:25
312.16:206:25
412.16:196:24
512.16:196:24
612.16:196:23
712.16:196:23
812.16:196:22
912.16:186:22
1012.16:186:21
1112.06:186:21
1212.06:186:20
1312.06:176:20
1412.06:176:19
1512.06:176:19
1612.06:176:18
1712.06:166:18
1812.06:166:17
1912.06:166:17
2012.06:166:16
2112.06:156:16
2212.06:156:15
2312.06:156:15
2412.06:156:14
2512.06:156:14
2612.06:146:13
2712.06:146:13
2812.06:146:12
2912.06:146:12
3012.06:136:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.6 kWh/m².

For context, solar energy here swings from a low near 4.62 kWh/m² to a high of 5.83 kWh/m² in April across the year — September's 5.6 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Hazard calendar for Kuala Belait

In seasonPeak

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

Kuala Belait 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 Kuala Belait?

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

3.2
Sightseeing
7th-best month of the year
4.4
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Kuala Belait.

What to pack for Kuala Belait in September

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

In September, Kuala Belait 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 Kuala Belait 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 13 km away) is warmest in June 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
Jan28Warm
Feb27Warm
Mar28Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Kuala Belait 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 Kuala Belait peaks around April 15 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeApr 15UV 14Nov 22UV 11
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar13Extreme
Apr14Extreme
May13Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec11Extreme

Air quality in Kuala Belait 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 Kuala Belait is worst in May — around 68 µg/m³ PM2.5 (unhealthy), about 5.1× the cleanest month (October, 13 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMay 1764 µg/m³Oct 1815 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb48Poor
Mar47Poor
Apr34Moderate
May68Unhealthy
Jun35Moderate
Jul23Moderate
Aug23Moderate
Sep28Moderate
Oct13Moderate
Nov24Moderate
Dec24Moderate
Location & terrain

Where is Kuala Belait?

Kuala Belait sits at 4.6°N, 114.2°E, 5 m above sea level, in Brunei. The nearest listed city is Seria, 11 km away.

SeriaLiangMiriMarudiTutongBeluruSengkurongBandar Seri Begawan

Topography around Kuala Belait

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

Within 3 km, the terrain around Kuala Belait has only modest variations in elevation — a maximum elevation change of 26 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, significant variations in elevation — a maximum elevation change of 511 m.

The land around Kuala Belait is covered by trees (37%), water (28%) and artificial surfaces (21%) within 3 km, trees (49%) and water (45%) within 16 km, and trees (58%) and water (40%) within 80 km.

3 km
26 m
16 km
73 m
80 km
511 m
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Seria 11 km · Liang 31 km · Miri 34 km · Marudi 46 km · Tutong 52 km · Beluru 68 km · Sengkurong 75 km · Bandar Seri Begawan 86 km

Brunei travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type G
240 V · 50 Hz
Prices
≈ 35% of US
price level, 2025
GDP per capita
$32,235
2025
Homicide rate
0.5
per 100k, 2013
Road deaths
7.5
per 100k/yr, 2019
Income group
High
World Bank
Religion
Muslim 82%Christian 7%Buddhist 6%other 5%

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 Kuala Belait (4.5836°, 114.2312°, elevation 5 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).