Tanjung Selor weather in September

In September, Tanjung Selor sees average daytime highs of 32°C and overnight lows near 23°C, with 253 mm of rain across 27.2 wet days and about 12 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°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 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Tanjung Selor's 2nd-clearest and 6th-windiest month. For the whole year in context, see Tanjung Selor's year-round climate.

Daytime high
32°
1st warmest
Overnight low
23°
5th coldest
Rainfall
253 mm
27.2 wet days
Daylight
12 hours
6:04 AM – 6:05 PM
Cloud cover
77%
2nd clearest
Wind
4 km/h
6th windiest
Solar energy
5.4 kWh/m²
Travel score
2.4
out of 10

Tanjung Selor is capital of Bulungan Regency and North Kalimantan Province, Indonesia.

Density
53/km²
people per km²
Founded
1790

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 32°C through the month.

A typical September day in Tanjung Selor reaches about 32°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°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)
13223
23223
33223
43223
53223
63223
73223
83223
93223
103223
113223
123223
133223
143223
153223
163223
173223
183223
193223
203223
213223
223223
233223
243223
253223
263223
273223
283123
293123
303123

How September really feels in Tanjung Selor

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.

Tanjung Selor weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°27927.111.92.9
Feb30° / 23°20924.311.92.8
Mar31° / 23°25428122.6
Apr31° / 23°25627.412.12.5
May31° / 23°29029.512.12.4
Jun31° / 23°25126.512.22.6
Jul31° / 23°22026.712.12.7
Aug31° / 23°22026.412.12.6
Sep32° / 23°25327.2122.4
Oct31° / 23°29428.811.92.4
Nov31° / 23°31329.211.92.4
Dec31° / 23°30929.211.82.5

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 16% of September, with mostly cloudy or overcast conditions the remaining 80%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12575
22575
32575
42575
52575
62575
72476
82476
92377
102278
112179
122179
132080
142080
151981
161981
171981
181882
191882
201882
211882
221882
231882
241882
251882
261783
271783
281783
291783
301783

Chance of precipitation in September

Any precipitation

Tanjung Selor gets around 253 mm of rain over 27.2 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 91% and peaks near 92% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
192
292
392
492
592
691
791
891
991
1091
1190
1290
1390
1490
1590
1690
1790
1890
1990
2090
2190
2290
2390
2490
2591
2691
2791
2891
2991
3091

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16337
26337
36436
46436
56535
66535
76535
86535
96535
106535
116535
126535
136535
146436
156337
166337
176238
186139
196040
205941
215842
225743
235743
245644
255545
265545
275545
285446
295446
305446

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 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
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 6:09 AM to 6:01 AM, and sunset from 6:12 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:096:12
212.16:086:11
312.06:086:11
412.06:086:11
512.06:086:10
612.06:076:10
712.06:076:09
812.06:076:09
912.06:066:08
1012.06:066:08
1112.06:066:08
1212.06:066:07
1312.06:056:07
1412.06:056:06
1512.06:056:06
1612.06:046:05
1712.06:046:05
1812.06:046:04
1912.06:046:04
2012.06:036:04
2112.06:036:03
2212.06:036:03
2312.06:026:02
2412.06:026:02
2512.06:026:01
2612.06:026:01
2712.06:016:00
2812.06:016:00
2912.06:016:00
3012.06:015:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.4 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.3 kWh/m² to a high of 5.4 kWh/m² in September across the year — September's 5.4 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in September

Hazard calendar for Tanjung Selor

In seasonPeak

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

Tanjung Selor 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 Tanjung Selor?

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

2.4
Sightseeing
9th-best month of the year
3.8
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Tanjung Selor.

What to pack for Tanjung Selor in September

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

In September, Tanjung Selor sees daytime highs around 32°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 Tanjung Selor 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 43 km away) is warmest in May at about 30°C and coldest in January near 29°C.

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

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Tanjung Selor 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 Tanjung Selor peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 12 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 16UV 15Jul 14UV 12
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr15Extreme
May14Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct13Extreme
Nov12Extreme
Dec12Extreme

Air quality in Tanjung Selor 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 Tanjung Selor is worst in September — around 24 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (January, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1323 µg/m³Jan 17 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar9Good
Apr11Good
May9Good
Jun10Good
Jul12Good
Aug19Moderate
Sep24Moderate
Oct14Moderate
Nov8Good
Dec7Good
Location & terrain

Where is Tanjung Selor?

Tanjung Selor sits at 2.8°N, 117.4°E, 9 m above sea level, in Indonesia. The nearest listed city is Tarakan, 59 km away.

Bontang

Topography around Tanjung Selor

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

Within 3 km, the terrain around Tanjung Selor has only modest variations in elevation — a maximum elevation change of 142 m around an average of 8 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 356 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,364 m.

The land around Tanjung Selor is covered by trees (51%) within 3 km, trees (85%) within 16 km, and trees (66%) and water (26%) within 80 km.

3 km
142 m
16 km
356 m
80 km
1,364 m
treesshrubsgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Tarakan 59 km · Malinau 117 km · Nunukan 148 km · Tawau 167 km · Semporna 229 km · Lahad Datu 265 km · Bandar Nabawan 266 km · Bontang 301 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

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 Tanjung Selor (2.8375°, 117.3653°, elevation 9 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).