Sentani weather in September

In September, Sentani sees average daytime highs of 28°C and overnight lows near 25°C, with 183 mm of rain across 24.3 wet days and about 12 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 17% 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 Sentani's 2nd-clearest and 7th-windiest month. For the whole year in context, see Sentani's year-round climate.

Daytime high: 28°; 5th warmest
Overnight low: 25°; 3rd coldest
Rainfall: 183 mm; 24.3 wet days
Daylight: 12 hours; 5:33 AM – 5:32 PM
Cloud cover: 70%; 2nd clearest
Wind: 8 km/h; 7th windiest
Solar energy: 5.36 kWh/m²
Travel score: 3.8; out of 10

Sentani is capital of Jayapura Regency, Papua Province, Indonesia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Sentani year-round climate October →Best places to visit in September

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Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Sentani reaches about 28°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	29	29	29	29	29	29	29
Avg low (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25

	Avg high (°C)	Avg low (°C)
1	28	25
2	28	25
3	28	25
4	28	25
5	28	25
6	28	25
7	28	25
8	28	25
9	28	25
10	28	25
11	28	25
12	28	25
13	28	25
14	28	25
15	28	25
16	28	25
17	28	25
18	28	25
19	28	25
20	28	25
21	28	25
22	28	25
23	28	25
24	29	25
25	29	25
26	29	25
27	29	25
28	29	25
29	29	25
30	29	25

How September really feels in Sentani

Once humidity and wind are folded in, September averages 7 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Sentani weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 25°	233	26.9	12.1	3.4
Feb	28° / 25°	226	24.2	12.1	3.4
Mar	28° / 25°	254	27.5	12	3.4
Apr	28° / 25°	242	27.4	11.9	3.3
May	29° / 25°	200	27.1	11.9	3.4
Jun	28° / 25°	201	26.5	11.9	3.5
Jul	28° / 25°	209	25.4	11.9	4.0
Aug	28° / 25°	198	24.8	11.9	4.0
Sep	28° / 25°	183	24.3	12	3.8
Oct	29° / 25°	183	25.3	12.1	3.6
Nov	29° / 25°	224	26.9	12.1	3.3
Dec	29° / 25°	256	28.1	12.1	3.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 67%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	36	35	35	34	34	34	34	33	33	33	33	33	32	32	32	32	32	33	33	33	33	33	33	33	34	34	35	35	34	34
Cloudier (%)	64	65	65	66	66	66	66	67	67	67	67	67	68	68	68	68	68	67	67	67	67	67	67	67	66	66	65	65	66	66

	Clearer (%)	Cloudier (%)
1	36	64
2	35	65
3	35	65
4	34	66
5	34	66
6	34	66
7	34	66
8	33	67
9	33	67
10	33	67
11	33	67
12	33	67
13	32	68
14	32	68
15	32	68
16	32	68
17	32	68
18	33	67
19	33	67
20	33	67
21	33	67
22	33	67
23	33	67
24	33	67
25	34	66
26	34	66
27	35	65
28	35	65
29	34	66
30	34	66

Chance of precipitation in September

Any precipitation

Sentani gets around 183 mm of rain over 24.3 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 83% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	82	82	83	83	83	83	82	82	82	81	81	81	80	80	80	80	80	79	79	79	79	79	79	79	79	79	79	78	78	78

	Rain chance (%)
1	82
2	82
3	83
4	83
5	83
6	83
7	82
8	82
9	82
10	81
11	81
12	81
13	80
14	80
15	80
16	80
17	80
18	79
19	79
20	79
21	79
22	79
23	79
24	79
25	79
26	79
27	79
28	78
29	78
30	78

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 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Oppressive (%)	87	87	87	87	87	87	87	87	87	87	87	86	86	86	85	85	84	84	83	83	82	81	81	80	80	79	79	78	78	78
Miserable (%)	13	13	13	13	13	13	13	13	13	13	13	14	14	14	15	15	16	16	17	17	18	19	19	20	20	21	21	22	22	22

	Oppressive (%)	Miserable (%)
1	87	13
2	87	13
3	87	13
4	87	13
5	87	13
6	87	13
7	87	13
8	87	13
9	87	13
10	87	13
11	87	13
12	86	14
13	86	14
14	86	14
15	85	15
16	85	15
17	84	16
18	84	16
19	83	17
20	83	17
21	82	18
22	81	19
23	81	19
24	80	20
25	80	20
26	79	21
27	79	21
28	78	22
29	78	22
30	78	22

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	8	calm
2	8	calm
3	8	calm
4	8	calm
5	8	calm
6	8	calm
7	8	calm
8	8	calm
9	8	calm
10	8	calm
11	8	calm
12	8	calm
13	8	calm
14	8	calm
15	8	calm
16	8	calm
17	8	calm
18	8	calm
19	8	calm
20	8	calm
21	8	calm
22	8	calm
23	8	calm
24	8	calm
25	8	calm
26	8	calm
27	8	calm
28	8	calm
29	8	calm
30	8	calm

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 5:39 AM to 5:27 AM, and sunset from 5:36 PM to 5:28 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	5:39	5:39	5:38	5:38	5:37	5:37	5:37	5:36	5:36	5:35	5:35	5:34	5:34	5:34	5:33	5:33	5:32	5:32	5:31	5:31	5:30	5:30	5:30	5:29	5:29	5:28	5:28	5:27	5:27	5:27
Sunset (PM)	5:36	5:36	5:36	5:35	5:35	5:35	5:35	5:34	5:34	5:34	5:33	5:33	5:33	5:32	5:32	5:32	5:32	5:31	5:31	5:31	5:30	5:30	5:30	5:29	5:29	5:29	5:29	5:28	5:28	5:28

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	5:39	5:36
2	12.0	5:39	5:36
3	12.0	5:38	5:36
4	12.0	5:38	5:35
5	12.0	5:37	5:35
6	12.0	5:37	5:35
7	12.0	5:37	5:35
8	12.0	5:36	5:34
9	12.0	5:36	5:34
10	12.0	5:35	5:34
11	12.0	5:35	5:33
12	12.0	5:34	5:33
13	12.0	5:34	5:33
14	12.0	5:34	5:32
15	12.0	5:33	5:32
16	12.0	5:33	5:32
17	12.0	5:32	5:32
18	12.0	5:32	5:31
19	12.0	5:31	5:31
20	12.0	5:31	5:31
21	12.0	5:30	5:30
22	12.0	5:30	5:30
23	12.0	5:30	5:30
24	12.0	5:29	5:29
25	12.0	5:29	5:29
26	12.0	5:28	5:29
27	12.0	5:28	5:29
28	12.0	5:27	5:28
29	12.0	5:27	5:28
30	12.0	5:27	5:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.36 kWh/m².

For context, solar energy here swings from a low near 4.49 kWh/m² to a high of 5.62 kWh/m² in October across the year — September's 5.36 kWh/m² sits near the top of that range.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.4	5.5	5.5	5.5	5.5	5.5	5.5	5.6	5.6	5.6	5.6
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.2	Bright
2	5.2	Bright
3	5.2	Bright
4	5.2	Bright
5	5.2	Bright
6	5.2	Bright
7	5.2	Bright
8	5.2	Bright
9	5.2	Bright
10	5.3	Bright
11	5.3	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.3	Bright
16	5.4	Bright
17	5.4	Bright
18	5.4	Bright
19	5.4	Bright
20	5.4	Bright
21	5.5	Bright
22	5.5	Bright
23	5.5	Bright
24	5.5	Bright
25	5.5	Bright
26	5.5	Bright
27	5.6	Bright
28	5.6	Bright
29	5.6	Bright
30	5.6	Bright

Planning a trip in September

Is September a good time to visit Sentani?

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

3.8

Sightseeing

3rd-best month of the year

4.5

Beach & pool

1st-best month of the year

September is a weaker month for outdoor sightseeing in Sentani.

What to pack for Sentani in September

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

In September, Sentani sees daytime highs around 28°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 Sentani 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 25 km away) is warmest in November at about 30°C and coldest in February near 29°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	29	29	29	29	30	30	29	29	29	30	30	29
Comfort	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	29	Tropical
Feb	29	Tropical
Mar	29	Tropical
Apr	29	Tropical
May	30	Tropical
Jun	30	Tropical
Jul	29	Tropical
Aug	29	Tropical
Sep	29	Tropical
Oct	30	Tropical
Nov	30	Tropical
Dec	29	Tropical

UV index in Sentani 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 Sentani peaks around March 10 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 11 (extreme).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	15	16	16	14	13	11	11	12	14	14	13	13
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	16	Extreme
Mar	16	Extreme
Apr	14	Extreme
May	13	Extreme
Jun	11	Extreme
Jul	11	Extreme
Aug	12	Extreme
Sep	14	Extreme
Oct	14	Extreme
Nov	13	Extreme
Dec	13	Extreme

Location & terrain

Where is Sentani?

Sentani sits at 2.6°S, 140.5°E, 100 m above sea level, in Indonesia. The nearest listed city is Abepura, 14 km away.

Topography around Sentani

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

Within 3 km, the terrain around Sentani has significant variations in elevation — a maximum elevation change of 368 m around an average of 129 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,985 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,957 m.

The land around Sentani is covered by trees (63%) within 3 km, trees (74%) within 16 km, and trees (66%) and water (33%) within 80 km.

3 km

368 m

trees 63%

16 km

1,985 m

trees 74%

80 km

1,957 m

trees 66%

treesgrasslandcroplandartificial surfacesbare terrainwater

← August Sentani year-round climate October →Best places to visit in September

September weather nearby: Abepura 14 km · Jayapura 23 km · Wamena 243 km · Tiom 274 km · Mulia 308 km · Wewak 363 km · Agats 423 km · Timika 483 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

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 Sentani (-2.5691°, 140.5127°, elevation 100 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).

	Avg high (°C)	Avg low (°C)
1	28	25
2	28	25
3	28	25
4	28	25
5	28	25
6	28	25
7	28	25
8	28	25
9	28	25
10	28	25
11	28	25
12	28	25
13	28	25
14	28	25
15	28	25
16	28	25
17	28	25
18	28	25
19	28	25
20	28	25
21	28	25
22	28	25
23	28	25
24	29	25
25	29	25
26	29	25
27	29	25
28	29	25
29	29	25
30	29	25

	Clearer (%)	Cloudier (%)
1	36	64
2	35	65
3	35	65
4	34	66
5	34	66
6	34	66
7	34	66
8	33	67
9	33	67
10	33	67
11	33	67
12	33	67
13	32	68
14	32	68
15	32	68
16	32	68
17	32	68
18	33	67
19	33	67
20	33	67
21	33	67
22	33	67
23	33	67
24	33	67
25	34	66
26	34	66
27	35	65
28	35	65
29	34	66
30	34	66

	Rain chance (%)
1	82
2	82
3	83
4	83
5	83
6	83
7	82
8	82
9	82
10	81
11	81
12	81
13	80
14	80
15	80
16	80
17	80
18	79
19	79
20	79
21	79
22	79
23	79
24	79
25	79
26	79
27	79
28	78
29	78
30	78

	Oppressive (%)	Miserable (%)
1	87	13
2	87	13
3	87	13
4	87	13
5	87	13
6	87	13
7	87	13
8	87	13
9	87	13
10	87	13
11	87	13
12	86	14
13	86	14
14	86	14
15	85	15
16	85	15
17	84	16
18	84	16
19	83	17
20	83	17
21	82	18
22	81	19
23	81	19
24	80	20
25	80	20
26	79	21
27	79	21
28	78	22
29	78	22
30	78	22

	Avg high (°C)	Avg low (°C)
1	28	25
2	28	25
3	28	25
4	28	25
5	28	25
6	28	25
7	28	25
8	28	25
9	28	25
10	28	25
11	28	25
12	28	25
13	28	25
14	28	25
15	28	25
16	28	25
17	28	25
18	28	25
19	28	25
20	28	25
21	28	25
22	28	25
23	28	25
24	29	25
25	29	25
26	29	25
27	29	25
28	29	25
29	29	25
30	29	25

	Clearer (%)	Cloudier (%)
1	36	64
2	35	65
3	35	65
4	34	66
5	34	66
6	34	66
7	34	66
8	33	67
9	33	67
10	33	67
11	33	67
12	33	67
13	32	68
14	32	68
15	32	68
16	32	68
17	32	68
18	33	67
19	33	67
20	33	67
21	33	67
22	33	67
23	33	67
24	33	67
25	34	66
26	34	66
27	35	65
28	35	65
29	34	66
30	34	66

	Rain chance (%)
1	82
2	82
3	83
4	83
5	83
6	83
7	82
8	82
9	82
10	81
11	81
12	81
13	80
14	80
15	80
16	80
17	80
18	79
19	79
20	79
21	79
22	79
23	79
24	79
25	79
26	79
27	79
28	78
29	78
30	78

	Oppressive (%)	Miserable (%)
1	87	13
2	87	13
3	87	13
4	87	13
5	87	13
6	87	13
7	87	13
8	87	13
9	87	13
10	87	13
11	87	13
12	86	14
13	86	14
14	86	14
15	85	15
16	85	15
17	84	16
18	84	16
19	83	17
20	83	17
21	82	18
22	81	19
23	81	19
24	80	20
25	80	20
26	79	21
27	79	21
28	78	22
29	78	22
30	78	22

	Avg high (°C)	Avg low (°C)
1	28	25
2	28	25
3	28	25
4	28	25
5	28	25
6	28	25
7	28	25
8	28	25
9	28	25
10	28	25
11	28	25
12	28	25
13	28	25
14	28	25
15	28	25
16	28	25
17	28	25
18	28	25
19	28	25
20	28	25
21	28	25
22	28	25
23	28	25
24	29	25
25	29	25
26	29	25
27	29	25
28	29	25
29	29	25
30	29	25

	Clearer (%)	Cloudier (%)
1	36	64
2	35	65
3	35	65
4	34	66
5	34	66
6	34	66
7	34	66
8	33	67
9	33	67
10	33	67
11	33	67
12	33	67
13	32	68
14	32	68
15	32	68
16	32	68
17	32	68
18	33	67
19	33	67
20	33	67
21	33	67
22	33	67
23	33	67
24	33	67
25	34	66
26	34	66
27	35	65
28	35	65
29	34	66
30	34	66

	Rain chance (%)
1	82
2	82
3	83
4	83
5	83
6	83
7	82
8	82
9	82
10	81
11	81
12	81
13	80
14	80
15	80
16	80
17	80
18	79
19	79
20	79
21	79
22	79
23	79
24	79
25	79
26	79
27	79
28	78
29	78
30	78

	Oppressive (%)	Miserable (%)
1	87	13
2	87	13
3	87	13
4	87	13
5	87	13
6	87	13
7	87	13
8	87	13
9	87	13
10	87	13
11	87	13
12	86	14
13	86	14
14	86	14
15	85	15
16	85	15
17	84	16
18	84	16
19	83	17
20	83	17
21	82	18
22	81	19
23	81	19
24	80	20
25	80	20
26	79	21
27	79	21
28	78	22
29	78	22
30	78	22