Bintuni weather in September

In September, Bintuni sees average daytime highs of 30°C and overnight lows near 23°C, with 215 mm of rain across 24.2 wet days and about 12 hours of daylight. It is the 8th-warmest and 8th-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 4% of the time in September, and the air most often feels oppressive.

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 Bintuni's 2nd-clearest and 7th-windiest month. For the whole year in context, see Bintuni's year-round climate.

Daytime high
30°
8th warmest
Overnight low
23°
3rd coldest
Rainfall
215 mm
24.2 wet days
Daylight
12 hours
6:01 AM – 6:00 PM
Cloud cover
78%
2nd clearest
Wind
5 km/h
7th windiest
Solar energy
4.93 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 Bintuni reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°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)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023

How September really feels in Bintuni

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.

Bintuni weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°2812912.12.6
Feb30° / 23°2782612.12.6
Mar30° / 23°31029.5122.6
Apr30° / 23°31028.9122.6
May30° / 24°24427.411.92.9
Jun30° / 23°24326.211.93.1
Jul29° / 23°20924.111.93.5
Aug30° / 23°19622.311.93.6
Sep30° / 23°21524.2123.2
Oct31° / 23°20924.9123.0
Nov31° / 23°21226.112.12.7
Dec30° / 23°26229.212.12.5

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 15% of September, with mostly cloudy or overcast conditions the remaining 81%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12080
22080
31981
41882
51882
61882
71882
81783
91783
101783
111783
121882
131882
141981
152080
162080
172080
182080
192179
202179
212080
222080
232080
242080
252080
262080
272080
282080
292080
302080

Chance of precipitation in September

Any precipitation

Bintuni gets around 215 mm of rain over 24.2 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 80% and peaks near 82% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
180
281
381
481
581
682
782
882
982
1081
1181
1281
1381
1480
1580
1680
1779
1879
1979
2079
2179
2279
2379
2479
2579
2679
2779
2879
2979
3079

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 81% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
138710
238710
338710
448610
548610
648511
748511
858312
958312
1058213
1168113
1268113
1368014
1468014
1567915
1667915
1767915
1857916
1957916
2057817
2147917
2247917
2337918
2437918
2528018
2627919
2727919
2817920
2917920
3017821

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:07 AM to 5:55 AM, and sunset from 6:04 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:076:04
212.06:066:04
312.06:066:04
412.06:066:04
512.06:056:03
612.06:056:03
712.06:046:03
812.06:046:02
912.06:046:02
1012.06:036:02
1112.06:036:01
1212.06:026:01
1312.06:026:01
1412.06:016:01
1512.06:016:00
1612.06:016:00
1712.06:006:00
1812.06:005:59
1912.05:595:59
2012.05:595:59
2112.05:585:58
2212.05:585:58
2312.05:585:58
2412.05:575:57
2512.05:575:57
2612.05:565:57
2712.05:565:57
2812.05:565:56
2912.05:555:56
3012.05:555:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.93 kWh/m².

For context, solar energy here swings from a low near 4.15 kWh/m² to a high of 5.26 kWh/m² in October across the year — September's 4.93 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
Planning a trip in September

Is September a good time to visit Bintuni?

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

3.2
Sightseeing
3rd-best month of the year
4.4
Beach & pool
3rd-best month of the year

September is a weaker month for outdoor sightseeing in Bintuni.

What to pack for Bintuni in September

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

In September, Bintuni sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Bintuni 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 32 km away) is warmest in April 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°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan30Tropical
Feb30Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun29Tropical
Jul29Tropical
Aug28Tropical
Sep29Tropical
Oct29Tropical
Nov30Tropical
Dec30Tropical

UV index in Bintuni in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bintuni peaks around March 13 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 13UV 16Jul 11UV 11
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May12Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep14Extreme
Oct15Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is Bintuni?

Bintuni sits at 2.1°S, 133.5°E, 12 m above sea level, in Indonesia. The nearest listed city is Ransiki, 98 km away.

SorongBiakWaisai

Topography around Bintuni

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

Within 3 km, the terrain around Bintuni has only modest variations in elevation — a maximum elevation change of 226 m around an average of 51 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 502 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,799 m.

The land around Bintuni is covered by trees (55%) and mangroves (34%) within 3 km, trees (54%) and mangroves (34%) within 16 km, and trees (65%) and water (21%) within 80 km.

3 km
226 m
16 km
502 m
80 km
2,799 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Ransiki 98 km · Manokwari 151 km · Fakfak 164 km · Teminabuan 184 km · Nabire 260 km · Sorong 286 km · Biak 303 km · Waisai 395 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 Bintuni (-2.1097°, 133.5246°, elevation 12 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).