Sintang weather in September

In September, Sintang sees average daytime highs of 32°C and overnight lows near 24°C, with 237 mm of rain across 21.7 wet days and about 12 hours of daylight. It is the 2nd-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 3% 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 Sintang's 5th-clearest and 3rd-windiest month. For the whole year in context, see Sintang's year-round climate.

Daytime high: 32°; 2nd warmest
Overnight low: 24°; 6th coldest
Rainfall: 237 mm; 21.7 wet days
Daylight: 12 hours; 5:28 AM – 5:28 PM
Cloud cover: 83%; 5th clearest
Wind: 4 km/h; 3rd windiest
Solar energy: 4.95 kWh/m²
Travel score: 2.8; out of 10

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

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 Sintang reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°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)	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32
Avg low (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	32	24
18	32	24
19	32	24
20	32	24
21	32	24
22	32	24
23	32	24
24	32	24
25	32	24
26	32	24
27	32	24
28	32	24
29	32	24
30	32	24

How September really feels in Sintang

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

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.

Sintang weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 24°	275	26.7	12	2.6
Feb	31° / 24°	229	23	12	2.7
Mar	31° / 24°	266	26.9	12	2.5
Apr	32° / 24°	266	27.5	12	2.3
May	32° / 24°	243	25	12	2.6
Jun	32° / 24°	186	20	12	3.1
Jul	32° / 24°	160	17.5	12	3.4
Aug	32° / 24°	165	17.5	12	3.2
Sep	32° / 24°	237	21.7	12	2.8
Oct	31° / 24°	313	27.8	12	2.4
Nov	31° / 24°	318	28.6	12	2.3
Dec	31° / 24°	267	28.2	12	2.4

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%.

	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 (%)	17	17	17	17	16	15	15	15	15	15	14	13	13	13	13	12	12	12	12	11	11	11	10	10	10	9	9	8	8	8
Cloudier (%)	83	83	83	83	84	85	85	85	85	85	86	87	87	87	87	88	88	88	88	89	89	89	90	90	90	91	91	92	92	92

	Clearer (%)	Cloudier (%)
1	17	83
2	17	83
3	17	83
4	17	83
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	14	86
12	13	87
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	11	89
21	11	89
22	11	89
23	10	90
24	10	90
25	10	90
26	9	91
27	9	91
28	8	92
29	8	92
30	8	92

Chance of precipitation in September

Any precipitation

Sintang gets around 237 mm of rain over 21.7 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 72% and peaks near 81% on the wettest days. The odds climb toward the end of the month.

	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 (%)	69	70	70	70	70	70	70	70	70	69	69	69	69	69	69	70	70	71	72	72	73	74	75	76	77	78	79	80	81	81

	Rain chance (%)
1	69
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	69
11	69
12	69
13	69
14	69
15	69
16	70
17	70
18	71
19	72
20	72
21	73
22	74
23	75
24	76
25	77
26	78
27	79
28	80
29	81
30	81

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 60% 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
Muggy (%)	3	3	3	3	3	3	3	3	3	3	2	2	2	2	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0
Oppressive (%)	47	47	46	46	45	45	44	44	43	43	43	42	42	41	40	39	38	37	36	35	34	33	32	31	31	30	29	29	28	28
Miserable (%)	50	50	51	51	52	52	53	53	54	54	55	56	56	57	59	60	61	62	63	64	65	66	67	69	69	70	71	71	72	72

	Muggy (%)	Oppressive (%)	Miserable (%)
1	3	47	50
2	3	47	50
3	3	46	51
4	3	46	51
5	3	45	52
6	3	45	52
7	3	44	53
8	3	44	53
9	3	43	54
10	3	43	54
11	2	43	55
12	2	42	56
13	2	42	56
14	2	41	57
15	1	40	59
16	1	39	60
17	1	38	61
18	1	37	62
19	1	36	63
20	1	35	64
21	1	34	65
22	1	33	66
23	1	32	67
24	0	31	69
25	0	31	69
26	0	30	70
27	0	29	71
28	0	29	71
29	0	28	72
30	0	28	72

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.

	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)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
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	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	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 5:34 AM to 5:23 AM, and sunset from 5:34 PM to 5:23 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)	5:34	5:33	5:33	5:33	5:32	5:32	5:32	5:31	5:31	5:31	5:30	5:30	5:29	5:29	5:29	5:28	5:28	5:28	5:27	5:27	5:26	5:26	5:26	5:25	5:25	5:25	5:24	5:24	5:24	5:23
Sunset (PM)	5:34	5:33	5:33	5:33	5:32	5:32	5:32	5:31	5:31	5:31	5:30	5:30	5:29	5:29	5:29	5:28	5:28	5:28	5:27	5:27	5:26	5:26	5:26	5:25	5:25	5:25	5:24	5:24	5:24	5:23

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

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.95 kWh/m².

For context, solar energy here swings from a low near 4.25 kWh/m² to a high of 5.14 kWh/m² in August across the year — September's 4.95 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)	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.8
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	5.0	Bright
2	5.0	Bright
3	5.0	Bright
4	5.0	Bright
5	5.0	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	5.0	Bright
12	5.0	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	5.0	Bright
17	5.0	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	4.9	Bright
24	4.9	Bright
25	4.9	Bright
26	4.9	Bright
27	4.8	Bright
28	4.8	Bright
29	4.8	Bright
30	4.8	Bright

Planning a trip in September

Is September a good time to visit Sintang?

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

2.8

Sightseeing

4th-best month of the year

4.4

Beach & pool

4th-best month of the year

September is a weaker month for outdoor sightseeing in Sintang.

What to pack for Sintang in September

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

In September, Sintang sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Sintang 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 Sintang peaks around February 20 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 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)	14	16	15	15	13	11	11	13	13	14	12	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

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

Air quality in Sintang 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 Sintang is worst in September — around 61 µg/m³ PM2.5 (unhealthy), about 4.7× the cleanest month (January, 13 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	13	14	16	16	16	15	21	43	61	27	15	14
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor	Unhealthy	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	14	Moderate
Mar	16	Moderate
Apr	16	Moderate
May	16	Moderate
Jun	15	Moderate
Jul	21	Moderate
Aug	43	Poor
Sep	61	Unhealthy
Oct	27	Moderate
Nov	15	Moderate
Dec	14	Moderate

Location & terrain

Where is Sintang?

Sintang sits at 0.1°N, 111.5°E, 24 m above sea level, in Indonesia. The nearest listed city is Engkilili, 121 km away.

Topography around Sintang

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

Within 3 km, the terrain around Sintang has only modest variations in elevation — a maximum elevation change of 39 m around an average of 24 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 814 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,640 m.

The land around Sintang is covered by trees (53%) and artificial surfaces (23%) within 3 km, trees (90%) within 16 km, and trees (98%) within 80 km.

3 km

39 m

trees 53%

16 km

814 m

trees 90%

80 km

1,640 m

trees 98%

treesgrasslandartificial surfacesbare terrainwater

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

September weather nearby: Engkilili 121 km · Sri Aman 131 km · Betong 148 km · Serian 160 km · Tebedu 165 km · Simunjan 168 km · Saratok 186 km · Siburan 189 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 Sintang (0.0667°, 111.5°, elevation 24 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. 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).

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	32	24
18	32	24
19	32	24
20	32	24
21	32	24
22	32	24
23	32	24
24	32	24
25	32	24
26	32	24
27	32	24
28	32	24
29	32	24
30	32	24

	Clearer (%)	Cloudier (%)
1	17	83
2	17	83
3	17	83
4	17	83
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	14	86
12	13	87
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	11	89
21	11	89
22	11	89
23	10	90
24	10	90
25	10	90
26	9	91
27	9	91
28	8	92
29	8	92
30	8	92

	Rain chance (%)
1	69
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	69
11	69
12	69
13	69
14	69
15	69
16	70
17	70
18	71
19	72
20	72
21	73
22	74
23	75
24	76
25	77
26	78
27	79
28	80
29	81
30	81

	Muggy (%)	Oppressive (%)	Miserable (%)
1	3	47	50
2	3	47	50
3	3	46	51
4	3	46	51
5	3	45	52
6	3	45	52
7	3	44	53
8	3	44	53
9	3	43	54
10	3	43	54
11	2	43	55
12	2	42	56
13	2	42	56
14	2	41	57
15	1	40	59
16	1	39	60
17	1	38	61
18	1	37	62
19	1	36	63
20	1	35	64
21	1	34	65
22	1	33	66
23	1	32	67
24	0	31	69
25	0	31	69
26	0	30	70
27	0	29	71
28	0	29	71
29	0	28	72
30	0	28	72

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	32	24
18	32	24
19	32	24
20	32	24
21	32	24
22	32	24
23	32	24
24	32	24
25	32	24
26	32	24
27	32	24
28	32	24
29	32	24
30	32	24

	Clearer (%)	Cloudier (%)
1	17	83
2	17	83
3	17	83
4	17	83
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	14	86
12	13	87
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	11	89
21	11	89
22	11	89
23	10	90
24	10	90
25	10	90
26	9	91
27	9	91
28	8	92
29	8	92
30	8	92

	Rain chance (%)
1	69
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	69
11	69
12	69
13	69
14	69
15	69
16	70
17	70
18	71
19	72
20	72
21	73
22	74
23	75
24	76
25	77
26	78
27	79
28	80
29	81
30	81

	Muggy (%)	Oppressive (%)	Miserable (%)
1	3	47	50
2	3	47	50
3	3	46	51
4	3	46	51
5	3	45	52
6	3	45	52
7	3	44	53
8	3	44	53
9	3	43	54
10	3	43	54
11	2	43	55
12	2	42	56
13	2	42	56
14	2	41	57
15	1	40	59
16	1	39	60
17	1	38	61
18	1	37	62
19	1	36	63
20	1	35	64
21	1	34	65
22	1	33	66
23	1	32	67
24	0	31	69
25	0	31	69
26	0	30	70
27	0	29	71
28	0	29	71
29	0	28	72
30	0	28	72

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	32	24
18	32	24
19	32	24
20	32	24
21	32	24
22	32	24
23	32	24
24	32	24
25	32	24
26	32	24
27	32	24
28	32	24
29	32	24
30	32	24

	Clearer (%)	Cloudier (%)
1	17	83
2	17	83
3	17	83
4	17	83
5	16	84
6	15	85
7	15	85
8	15	85
9	15	85
10	15	85
11	14	86
12	13	87
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	11	89
21	11	89
22	11	89
23	10	90
24	10	90
25	10	90
26	9	91
27	9	91
28	8	92
29	8	92
30	8	92

	Rain chance (%)
1	69
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	69
11	69
12	69
13	69
14	69
15	69
16	70
17	70
18	71
19	72
20	72
21	73
22	74
23	75
24	76
25	77
26	78
27	79
28	80
29	81
30	81

	Muggy (%)	Oppressive (%)	Miserable (%)
1	3	47	50
2	3	47	50
3	3	46	51
4	3	46	51
5	3	45	52
6	3	45	52
7	3	44	53
8	3	44	53
9	3	43	54
10	3	43	54
11	2	43	55
12	2	42	56
13	2	42	56
14	2	41	57
15	1	40	59
16	1	39	60
17	1	38	61
18	1	37	62
19	1	36	63
20	1	35	64
21	1	34	65
22	1	33	66
23	1	32	67
24	0	31	69
25	0	31	69
26	0	30	70
27	0	29	71
28	0	29	71
29	0	28	72
30	0	28	72