Kisaran weather in September

In September, Kisaran sees average daytime highs of 32°C and overnight lows near 24°C, with 278 mm of rain across 27.7 wet days and about 12 hours of daylight. It is the 7th-warmest and 4th-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 1% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Kisaran's 9th-clearest and 11th-windiest month. For the whole year in context, see Kisaran's year-round climate.

Daytime high
32°
7th warmest
Overnight low
24°
4th coldest
Rainfall
278 mm
27.7 wet days
Daylight
12 hours
6:15 AM – 6:16 PM
Cloud cover
88%
9th clearest
Wind
4 km/h
11th windiest
Solar energy
5.25 kWh/m²
Travel score
2.3
out of 10

Kisaran is capital of Asahan Regency, North Sumatra, Indonesia.

Density
2,253/km²
people per km²
Founded
1982

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

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 Kisaran 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 30°C and 33°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)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203224
213224
223224
233224
243224
253224
263224
273224
283224
293224
303224

How September really feels in Kisaran

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
30 feel dangerously hot (≥ 39°C)
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.

Kisaran weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°20825.311.82.8
Feb32° / 24°16121.811.92.7
Mar32° / 24°19425122.4
Apr33° / 24°23327.612.12.1
May33° / 24°23226.612.12.2
Jun33° / 24°16422.212.22.5
Jul32° / 24°16722.412.22.7
Aug32° / 24°20224.912.12.5
Sep32° / 24°27827.7122.3
Oct31° / 24°31629.211.92.3
Nov31° / 24°3282911.92.3
Dec31° / 24°29827.511.82.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% 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 93%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1793
2892
3892
4892
5892
6991
7991
8991
9991
10991
11892
12892
13892
14892
15892
16793
17793
18793
19694
20694
21595
22595
23595
24595
25595
26496
27397
28397
29397
30397

Chance of precipitation in September

Any precipitation

Kisaran gets around 278 mm of rain over 27.7 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 92% and peaks near 96% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
187
287
388
488
589
689
790
890
991
1091
1191
1291
1391
1492
1592
1692
1792
1892
1993
2093
2193
2294
2394
2494
2594
2695
2795
2895
2996
3096

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 88% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
11585
21585
31585
41585
51585
61585
71585
81585
91585
101585
111585
121585
131486
141486
151387
161387
171288
181288
191189
201189
211090
221090
23991
24991
25892
26892
27892
28892
29892
30892

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.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 6:20 AM to 6:12 AM, and sunset from 6:23 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:206:23
212.16:196:23
312.16:196:22
412.06:196:22
512.06:186:21
612.06:186:21
712.06:186:20
812.06:186:20
912.06:176:20
1012.06:176:19
1112.06:176:19
1212.06:176:18
1312.06:166:18
1412.06:166:17
1512.06:166:17
1612.06:156:16
1712.06:156:16
1812.06:156:15
1912.06:156:15
2012.06:146:15
2112.06:146:14
2212.06:146:14
2312.06:136:13
2412.06:136:13
2512.06:136:12
2612.06:136:12
2712.06:126:11
2812.06:126:11
2912.06:126:11
3012.06:126:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.25 kWh/m².

For context, solar energy here swings from a low near 4.25 kWh/m² to a high of 5.51 kWh/m² in March across the year — September's 5.25 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Kisaran

In seasonPeak

In September, Kisaran sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

Kisaran sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

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

Is September a good time to visit Kisaran?

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

2.3
Sightseeing
8th-best month of the year
3.6
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Kisaran.

What to pack for Kisaran in September

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

In September, Kisaran sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Kisaran in September

The nearest coast averages about 30°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 33 km away) is warmest in May at about 30°C and coldest in January 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
Feb29Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov29Tropical
Dec29Tropical

UV index in Kisaran 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 Kisaran peaks around February 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 21UV 14Jun 19UV 10
UV index (midday)Level
Jan12Extreme
Feb14Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun10Very high
Jul11Extreme
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec11Extreme

Air quality in Kisaran 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 Kisaran is worst in September — around 30 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1630 µg/m³Dec 1019 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb25Moderate
Mar27Moderate
Apr25Moderate
May25Moderate
Jun23Moderate
Jul27Moderate
Aug28Moderate
Sep30Moderate
Oct28Moderate
Nov20Moderate
Dec19Moderate
Location & terrain

Where is Kisaran?

Kisaran sits at 3.0°N, 99.6°E, 20 m above sea level, in Indonesia. The nearest listed city is Tanjungbalai, 21 km away.

Topography around Kisaran

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

Within 3 km, the terrain around Kisaran has only modest variations in elevation — a maximum elevation change of 24 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 79 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,188 m.

The land around Kisaran is covered by trees (70%) and artificial surfaces (25%) within 3 km, trees (85%) within 16 km, and trees (61%) and water (30%) within 80 km.

3 km
24 m
16 km
79 m
80 km
2,188 m
treesgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Tanjungbalai 21 km · Teluk Nibung 22 km · Pekan Bahapal 51 km · Pematangsiantar 61 km · Tebingtinggi 63 km · Perbaungan 98 km · Rantauprapat 101 km · Bandar 105 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 Kisaran (2.9845°, 99.6158°, elevation 20 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. 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).