Sinjai weather in September

In September, Sinjai sees average daytime highs of 28°C and overnight lows near 24°C, with 39 mm of rain across 9.6 wet days and about 12 hours of daylight. It is the 8th-warmest and 12th-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 46% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Sinjai's 1st-clearest and 3rd-windiest month. For the whole year in context, see Sinjai's year-round climate.

Daytime high
28°
8th warmest
Overnight low
24°
3rd coldest
Rainfall
39 mm
9.6 wet days
Daylight
12 hours
5:54 AM – 5:52 PM
Cloud cover
46%
1st clearest
Wind
10 km/h
3rd windiest
Solar energy
6.5 kWh/m²
Travel score
6.3
out of 10

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 Sinjai reaches about 28°C in the afternoon and slips back to 24°C overnight — a 5°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 about 1°C warmer than August and about 1°C cooler than October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12823
22823
32823
42823
52823
62824
72824
82824
92824
102824
112824
122824
132824
142824
152824
162824
172824
182824
192824
202824
212824
222824
232824
242824
252824
262924
272924
282924
292924
302924

How September really feels in Sinjai

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sinjai weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 25°1862512.33.4
Feb29° / 25°17022.912.23.3
Mar29° / 25°18626.9123.3
Apr28° / 25°19927.111.93.3
May28° / 24°20727.411.83.9
Jun27° / 24°21925.811.74.1
Jul27° / 23°16623.511.74.6
Aug27° / 23°6615.611.85.8
Sep28° / 24°399.6126.3
Oct29° / 24°6112.412.15.2
Nov30° / 25°11519.212.24.0
Dec29° / 25°18326.412.33.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 33%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17030
27030
37030
47030
57030
67030
77030
87030
97030
107030
117030
127030
137030
146832
156832
166832
176832
186733
196733
206733
216634
226634
236634
246535
256535
266436
276337
286238
296238
306139

Chance of precipitation in September

Any precipitation

Sinjai gets around 39 mm of rain over 9.6 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
237
336
436
535
634
733
833
932
1032
1131
1231
1331
1431
1531
1631
1731
1831
1932
2032
2132
2232
2332
2432
2532
2632
2733
2833
2933
3034

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
115643
215643
315742
415742
515742
615742
715742
815742
915742
1015742
1125543
1225543
1325444
1425444
1525345
1625246
1725147
1824948
1924849
2024751
2134651
2234453
2334354
2424256
2524157
2624058
2723959
2823761
2923662
3023563

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min 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 6 minutes over September. Sunrise moves from 6:02 AM to 5:47 AM, and sunset from 5:56 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:025:56
211.96:015:56
311.96:015:55
411.96:005:55
511.96:005:55
611.95:595:55
711.95:595:55
811.95:585:54
911.95:585:54
1011.95:575:54
1111.95:575:54
1212.05:565:53
1312.05:565:53
1412.05:555:53
1512.05:555:53
1612.05:545:52
1712.05:545:52
1812.05:535:52
1912.05:535:52
2012.05:525:52
2112.05:525:51
2212.05:515:51
2312.05:515:51
2412.05:505:51
2512.05:505:50
2612.05:495:50
2712.05:495:50
2812.05:485:50
2912.05:485:50
3012.05:475:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.5 kWh/m².

For context, solar energy here swings from a low near 4.39 kWh/m² to a high of 6.57 kWh/m² in October across the year — September's 6.5 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in September

Hazard calendar for Sinjai

In seasonPeak

None of Sinjai's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Sinjai sits in the South Indian Ocean cyclone belt; the season peaks January–March.

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

Is September a good time to visit Sinjai?

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

6.3
Sightseeing
1st-best month of the year
7.0
Beach & pool
1st-best month of the year

September is a reasonable time to visit Sinjai for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sinjai in September

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

In September, Sinjai sees daytime highs around 28°C and nights near 24°C. Pack light clothes and sun protection. Worth having: rain gear. About 10 days see rain.

light clothessun protectionrain gear

Sea temperature near Sinjai in September

The nearest coast averages about 28°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 14 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
Feb29Tropical
Mar30Tropical
Apr30Tropical
May29Tropical
Jun29Tropical
Jul28Warm
Aug28Warm
Sep28Tropical
Oct29Tropical
Nov30Tropical
Dec30Tropical

UV index in Sinjai 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 Sinjai peaks around February 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 15UV 15Jul 10UV 10
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug12Extreme
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec12Extreme
Location & terrain

Where is Sinjai?

Sinjai sits at 5.1°S, 120.3°E, 6 m above sea level, in Indonesia. The nearest listed city is Watampone, 66 km away.

Topography around Sinjai

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

Within 3 km, the terrain around Sinjai has only modest variations in elevation — a maximum elevation change of 100 m around an average of 21 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 717 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,838 m.

The land around Sinjai is covered by trees (38%) and cropland (21%) within 3 km, trees (46%) and water (35%) within 16 km, and trees (48%) and water (41%) within 80 km.

3 km
100 m
16 km
717 m
80 km
2,838 m
treesgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Watampone 66 km · Maros 76 km · Makassar 91 km · Galesong 101 km · Sengkang 114 km · Parepare 142 km · Polewali 213 km · Majene 226 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 Sinjai (-5.1241°, 120.253°, elevation 6 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).