Teluk Dalam weather in September

In September, Teluk Dalam sees average daytime highs of 28°C and overnight lows near 25°C, with 313 mm of rain across 25.3 wet days and about 12 hours of daylight. It is the 9th-warmest and 4th-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 2% 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 Teluk Dalam's 9th-clearest and 3rd-windiest month. For the whole year in context, see Teluk Dalam's year-round climate.

Daytime high
28°
9th warmest
Overnight low
25°
4th coldest
Rainfall
313 mm
25.3 wet days
Daylight
12 hours
6:23 AM – 6:23 PM
Cloud cover
87%
9th clearest
Wind
10 km/h
3rd windiest
Solar energy
5 kWh/m²
Travel score
3.8
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 Teluk Dalam reaches about 28°C in the afternoon and slips back to 25°C overnight — a 3°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.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12826
22826
32826
42826
52826
62826
72826
82826
92826
102825
112825
122825
132825
142825
152825
162825
172825
182825
192825
202825
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825

How September really feels in Teluk Dalam

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.

Teluk Dalam weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°23323.8123.8
Feb29° / 26°19019.6124.0
Mar29° / 26°24626123.5
Apr29° / 26°28926.3123.3
May29° / 26°21621.7123.8
Jun29° / 26°18518.3124.3
Jul28° / 26°22521.1124.1
Aug28° / 26°28824.8123.8
Sep28° / 25°31325.3123.8
Oct28° / 25°37327123.7
Nov28° / 25°44127.8123.4
Dec28° / 25°33426.2123.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 92%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1991
2991
3991
4991
5991
6991
7991
8991
91090
101090
111090
121090
13991
14991
15991
16991
17991
18991
19892
20892
21793
22793
23694
24694
25694
26694
27694
28595
29595
30694

Chance of precipitation in September

Any precipitation

Teluk Dalam gets around 313 mm of rain over 25.3 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 84% and peaks near 87% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
184
283
383
483
583
683
783
883
983
1083
1183
1283
1383
1483
1583
1683
1783
1884
1984
2084
2184
2285
2385
2485
2586
2686
2786
2887
2987
3087

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 87% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
18812
28812
38812
48713
58713
68713
78812
88812
98812
108812
118812
128812
138812
148812
158812
168812
178713
188713
198713
208713
218713
228713
238713
248713
258713
268713
278812
288812
298812
308911

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 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
149calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:28 AM to 6:18 AM, and sunset from 6:29 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:286:29
212.06:286:28
312.06:286:28
412.06:276:28
512.06:276:27
612.06:276:27
712.06:266:27
812.06:266:26
912.06:256:26
1012.06:256:26
1112.06:256:25
1212.06:246:25
1312.06:246:24
1412.06:246:24
1512.06:236:24
1612.06:236:23
1712.06:236:23
1812.06:226:22
1912.06:226:22
2012.06:226:22
2112.06:216:21
2212.06:216:21
2312.06:216:21
2412.06:206:20
2512.06:206:20
2612.06:206:19
2712.06:196:19
2812.06:196:19
2912.06:196:18
3012.06:186:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5 kWh/m².

For context, solar energy here swings from a low near 4.23 kWh/m² to a high of 5.54 kWh/m² in February across the year — September's 5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
Planning a trip in September

Is September a good time to visit Teluk Dalam?

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

3.8
Sightseeing
4th-best month of the year
4.1
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Teluk Dalam.

What to pack for Teluk Dalam in September

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

In September, Teluk Dalam sees daytime highs around 28°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Teluk Dalam 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 offshore is warmest in May at about 30°C and coldest in November near 29°C.

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

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb30Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Teluk Dalam 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 Teluk Dalam peaks around February 18 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 18UV 15Jul 10UV 11
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep14Extreme
Oct14Extreme
Nov12Extreme
Dec12Extreme

Air quality in Teluk Dalam 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 Teluk Dalam is worst in October — around 17 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodOct 1216 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar12Good
Apr11Good
May11Good
Jun11Good
Jul12Good
Aug11Good
Sep15Moderate
Oct17Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Teluk Dalam?

Teluk Dalam sits at 0.6°N, 97.8°E, 41 m above sea level, in Indonesia. The nearest listed city is Gunungsitoli, 82 km away.

Topography around Teluk Dalam

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

Within 3 km, the terrain around Teluk Dalam has only modest variations in elevation — a maximum elevation change of 168 m around an average of 29 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 480 m; within 80 km, large variations in elevation — a maximum elevation change of 837 m.

The land around Teluk Dalam is covered by trees (66%) and water (22%) within 3 km, water (59%) and trees (39%) within 16 km, and water (80%) and trees (20%) within 80 km.

3 km
168 m
16 km
480 m
80 km
837 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Gunungsitoli 82 km · Lahewa 116 km · Sibolga 169 km · Barus 173 km · Padangsidempuan 186 km · Singkil 191 km · Tarutung 206 km · Subulussalam 232 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 Teluk Dalam (0.5729°, 97.8034°, elevation 41 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).