Tutong weather in September

In September, Tutong sees average daytime highs of 30°C and overnight lows near 25°C, with 214 mm of rain across 23.4 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 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 Tutong's 8th-clearest and 5th-windiest month. For the whole year in context, see Tutong's year-round climate.

Daytime high
30°
6th warmest
Overnight low
25°
7th coldest
Rainfall
214 mm
23.4 wet days
Daylight
12 hours
6:15 AM – 6:17 PM
Cloud cover
83%
8th clearest
Wind
8 km/h
5th windiest
Solar energy
5.5 kWh/m²
Travel score
3.2
out of 10

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 Tutong 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 29°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 Tutong

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.

Tutong 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°22624.311.83.5
Feb29° / 24°16020.311.83.8
Mar29° / 24°14422.7123.6
Apr30° / 25°19425.512.13.0
May30° / 25°20824.312.23.1
Jun30° / 25°21121.412.33.4
Jul30° / 25°1942212.33.4
Aug30° / 25°19521.812.23.4
Sep30° / 25°21423.4123.2
Oct30° / 24°25827.611.93.0
Nov30° / 24°27228.211.82.8
Dec29° / 24°26628.211.73.0

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

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11684
21684
31684
41684
51486
61486
71486
81486
91387
101387
111387
121288
131288
141189
151189
161189
171189
181288
191288
201288
211288
221288
231288
241288
251288
261288
271288
281288
291189
301090

Chance of precipitation in September

Any precipitation

Tutong gets around 214 mm of rain over 23.4 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 78% and peaks near 84% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
178
278
378
478
578
678
778
878
978
1077
1177
1277
1376
1476
1575
1675
1775
1875
1975
2076
2177
2277
2378
2479
2580
2681
2782
2883
2984
3084

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 57% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14357
24456
34456
44555
54555
64654
74654
84654
94654
104654
114654
124654
134654
144555
154555
164456
174357
184258
194159
204159
214159
224060
234060
244159
254159
264159
274258
284258
294357
304456

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.

0246810151015202530
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 6:18 AM to 6:12 AM, and sunset from 6:24 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:186:24
212.16:186:23
312.16:186:23
412.16:186:22
512.16:176:22
612.16:176:22
712.16:176:21
812.16:176:21
912.16:176:20
1012.16:166:20
1112.06:166:19
1212.06:166:19
1312.06:166:18
1412.06:156:18
1512.06:156:17
1612.06:156:17
1712.06:156:16
1812.06:146:15
1912.06:146:15
2012.06:146:14
2112.06:146:14
2212.06:146:13
2312.06:136:13
2412.06:136:12
2512.06:136:12
2612.06:136:12
2712.06:126:11
2812.06:126:11
2912.06:126:10
3012.06:126:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.5 kWh/m².

For context, solar energy here swings from a low near 4.52 kWh/m² to a high of 5.64 kWh/m² in April across the year — September's 5.5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.3Bright
Planning a trip in September

Hazard calendar for Tutong

In seasonPeak

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

Tutong 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 Tutong?

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
7th-best month of the year

September is a weaker month for outdoor sightseeing in Tutong.

What to pack for Tutong in September

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

In September, Tutong sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

Sea temperature near Tutong 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 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
Jan28Warm
Feb27Warm
Mar28Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Tutong 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 Tutong peaks around February 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 10 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 18UV 14Dec 10UV 11
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar14Extreme
Apr14Extreme
May14Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec11Extreme

Air quality in Tutong 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 Tutong is worst in September — around 25 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1525 µg/m³Dec 1916 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb21Moderate
Mar24Moderate
Apr22Moderate
May23Moderate
Jun21Moderate
Jul21Moderate
Aug21Moderate
Sep25Moderate
Oct20Moderate
Nov18Moderate
Dec16Moderate
Location & terrain

Where is Tutong?

Tutong sits at 4.8°N, 114.6°E, 8 m above sea level, in Brunei. The nearest listed city is Liang, 22 km away.

LiangSengkurongBandar Seri BegawanLimbangSeriaMentiriBangarSerasa

Topography around Tutong

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

Within 3 km, the terrain around Tutong has only modest variations in elevation — a maximum elevation change of 79 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 120 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,383 m.

The land around Tutong is covered by trees (44%) and water (31%) within 3 km, water (47%) and trees (46%) within 16 km, and trees (57%) and water (39%) within 80 km.

3 km
79 m
16 km
120 m
80 km
1,383 m
treesshrubsgrasslandartificial surfacesbare terrainwatermangroves
September weather nearby: Liang 22 km · Sengkurong 22 km · Bandar Seri Begawan 34 km · Limbang 40 km · Seria 42 km · Mentiri 45 km · Bangar 48 km · Serasa 51 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 Tutong (4.8028°, 114.6492°, 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).