Balikpapan weather in September

In September, Balikpapan sees average daytime highs of 30°C and overnight lows near 25°C, with 109 mm of rain across 17 wet days and about 12 hours of daylight. It is the 9th-warmest and 11th-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 15% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Balikpapan's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Balikpapan's year-round climate.

Daytime high
30°
9th warmest
Overnight low
25°
8th coldest
Rainfall
109 mm
17 wet days
Daylight
12 hours
6:07 AM – 6:07 PM
Cloud cover
71%
2nd clearest
Wind
9 km/h
2nd windiest
Solar energy
5.43 kWh/m²
Travel score
4.1
out of 10

Balikpapan is city in East Kalimantan Province, Indonesia.

Density
1,319/km²
people per km²
Founded
1897

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 Balikpapan 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 Balikpapan

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.

Balikpapan weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 25°25527.512.12.8
Feb30° / 25°22723.8122.9
Mar30° / 25°27127.8122.8
Apr30° / 25°26427.5122.7
May30° / 26°19827.611.92.9
Jun30° / 25°17224.911.93.2
Jul29° / 25°14222.411.93.7
Aug29° / 25°10117.9124.2
Sep30° / 25°10917124.1
Oct30° / 25°15822.3123.4
Nov30° / 25°21827.512.12.7
Dec30° / 25°26828.812.12.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23466
33466
43466
53466
63466
73367
83367
93367
103367
113268
123268
133367
143367
153367
163268
173268
183367
193466
203466
213466
223466
233367
243367
253268
263169
273169
283070
293070
302872

Chance of precipitation in September

Any precipitation

Balikpapan gets around 109 mm of rain over 17 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 58% and peaks near 62% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
160
260
360
460
559
659
759
859
958
1058
1158
1258
1357
1457
1557
1656
1756
1856
1956
2056
2156
2256
2356
2457
2557
2658
2759
2860
2961
3062

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
12872
22872
32872
42971
52971
62971
72971
82971
92872
102872
112773
122674
132575
142476
152377
162278
172179
182080
191882
201783
211684
221585
231486
241387
251288
261288
271288
281189
291189
301090

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

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

Days grow by about 0 minutes over September. Sunrise moves from 6:13 AM to 6:02 AM, and sunset from 6:12 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:136:12
212.06:136:11
312.06:126:11
412.06:126:11
512.06:126:10
612.06:116:10
712.06:116:10
812.06:106:09
912.06:106:09
1012.06:106:09
1112.06:096:08
1212.06:096:08
1312.06:086:08
1412.06:086:07
1512.06:086:07
1612.06:076:07
1712.06:076:06
1812.06:066:06
1912.06:066:06
2012.06:066:05
2112.06:056:05
2212.06:056:05
2312.06:046:04
2412.06:046:04
2512.06:046:04
2612.06:036:04
2712.06:036:03
2812.06:026:03
2912.06:026:03
3012.06:026:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.43 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.45 kWh/m² to a high of 5.43 kWh/m² in September across the year — September's 5.43 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Is September a good time to visit Balikpapan?

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

4.1
Sightseeing
2nd-best month of the year
5.5
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Balikpapan for sightseeing.

What to pack for Balikpapan in September

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

In September, Balikpapan sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.

light clothesrain gearsun protection

Sea temperature near Balikpapan 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 13 km away) is warmest in May at about 30°C and coldest in August near 28°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May30Tropical
Jun29Tropical
Jul29Tropical
Aug28Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Balikpapan 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 Balikpapan peaks around February 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 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 22UV 15Jul 10UV 11
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov12Extreme
Dec12Extreme

Air quality in Balikpapan 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 Balikpapan is worst in October — around 21 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (March, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodOct 1321 µg/m³Mar 2411 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar11Good
Apr11Good
May11Good
Jun11Good
Jul12Good
Aug13Moderate
Sep18Moderate
Oct21Moderate
Nov12Moderate
Dec11Good
Location & terrain

Where is Balikpapan?

Balikpapan sits at 1.3°S, 116.8°E, 67 m above sea level, in Indonesia. The nearest listed city is Loa Janan, 82 km away.

Martapura

Topography around Balikpapan

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

Within 3 km, the terrain around Balikpapan has only modest variations in elevation — a maximum elevation change of 97 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,262 m.

The land around Balikpapan is covered by artificial surfaces (41%) and water (39%) within 3 km, water (50%) and trees (31%) within 16 km, and trees (54%) and water (40%) within 80 km.

3 km
97 m
16 km
123 m
80 km
1,262 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Loa Janan 82 km · Samarinda 93 km · Bontang 172 km · Tanjung 187 km · Amuntai 217 km · Barabai 217 km · Muara Teweh 218 km · Martapura 323 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 Balikpapan (-1.2675°, 116.8289°, elevation 67 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. 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).