Hengchun weather in September

In September, Hengchun sees average daytime highs of 28°C and overnight lows near 26°C, with 213 mm of rain across 13.9 wet days and about 12.1 hours of daylight. It is the 4th-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 34% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Hengchun's 8th-clearest and 8th-windiest month. For the whole year in context, see Hengchun's year-round climate.

Daytime high
28°
4th warmest
Overnight low
26°
9th coldest
Rainfall
213 mm
13.9 wet days
Daylight
12 h 06 min
5:48 AM – 5:55 PM
Cloud cover
60%
8th clearest
Wind
23 km/h
8th windiest
Solar energy
5.33 kWh/m²
Travel score
5.6
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 Hengchun reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°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 about 1°C warmer than October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12827
22827
32827
42827
52827
62827
72827
82827
92827
102827
112827
122827
132827
142827
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302726

How September really feels in Hengchun

Once humidity and wind are folded in, September averages 15 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
15
heat index over the day's high
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.

Hengchun weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 20°488.310.87.0
Feb22° / 21°347.411.27.2
Mar24° / 22°296.611.87.7
Apr25° / 24°447.212.57.4
May27° / 26°17713.9135.9
Jun28° / 27°29819.813.34.5
Jul28° / 27°29219.513.24.5
Aug28° / 27°37020.112.84.5
Sep28° / 26°21313.912.15.6
Oct27° / 25°1066.611.57.3
Nov25° / 23°78610.97.8
Dec23° / 21°48710.77.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
24060
34159
44159
54357
64357
74555
84555
94654
104654
114753
124852
134951
144852
154852
164951
174951
184852
194852
204951
214951
224951
235149
245149
255248
265347
275347
285446
295446
305545

Chance of precipitation in September

Any precipitation

Hengchun gets around 213 mm of rain over 13.9 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 46% and peaks near 59% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
159
258
357
456
555
654
753
852
951
1050
1149
1249
1348
1447
1546
1646
1745
1844
1943
2042
2141
2241
2340
2439
2538
2637
2736
2835
2935
3034

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 51% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1002080
2012277
3012376
4012574
5012772
6012871
7013069
8023266
9023365
10023563
11033760
12033859
13034057
14044254
15044452
16044649
17054847
18055045
19055342
20065440
21065737
22075835
23076033
24086131
25086230
26096229
271106227
281116226
291126225
301136224

Wind in September

Winds average 23 km/h in September.

Across September, daily wind ranges from about 21 km/h on the calmest days to 26 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
121breezy
221breezy
321breezy
421breezy
521breezy
621breezy
721breezy
821breezy
922breezy
1022breezy
1122breezy
1222breezy
1323breezy
1423breezy
1523breezy
1623breezy
1724breezy
1824breezy
1924breezy
2025breezy
2125breezy
2225breezy
2325breezy
2425breezy
2526breezy
2626breezy
2726breezy
2826breezy
2926breezy
3026breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 5:43 AM to 5:52 AM, and sunset from 6:10 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:436:10
212.45:446:09
312.45:446:08
412.45:446:07
512.45:456:06
612.35:456:05
712.35:456:04
812.35:456:03
912.35:466:02
1012.35:466:01
1112.25:466:00
1212.25:465:59
1312.25:475:58
1412.25:475:57
1512.15:475:56
1612.15:485:55
1712.15:485:54
1812.15:485:53
1912.15:485:52
2012.05:495:51
2112.05:495:50
2212.05:495:49
2312.05:505:48
2412.05:505:47
2511.95:505:46
2611.95:505:45
2711.95:515:44
2811.95:515:43
2911.85:515:42
3011.85:525:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.33 kWh/m².

For context, solar energy here swings from a low near 3.37 kWh/m² to a high of 6.03 kWh/m² in April across the year — September's 5.33 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Hengchun

In seasonPeak

In September, Hengchun sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.

Hengchun sits in the Pacific typhoon belt; the season peaks July–October.

Hengchun's monsoon runs May–September, when most of the year's rain falls.

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

Is September a good time to visit Hengchun?

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

5.6
Sightseeing
9th-best month of the year
6.2
Beach & pool
5th-best month of the year

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

What to pack for Hengchun in September

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

In September, Hengchun sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 14 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Hengchun 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 18 km away) is warmest in July at about 29°C and coldest in January near 24°C.

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

22°24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb24Warm
Mar25Warm
Apr26Warm
May28Warm
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct28Warm
Nov26Warm
Dec25Warm

UV index in Hengchun in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hengchun peaks around August 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highVery highExtremeVery highHighAug 13UV 12Dec 21UV 6
UV index (midday)Level
Jan7High
Feb9Very high
Mar10Extreme
Apr10Very high
May10Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct9Very high
Nov8Very high
Dec6High

Air quality in Hengchun 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 Hengchun is worst in March — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (June, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 1416 µg/m³Jun 178 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb15Moderate
Mar16Moderate
Apr13Moderate
May9Good
Jun8Good
Jul9Good
Aug11Good
Sep10Good
Oct13Moderate
Nov13Moderate
Dec15Moderate
Location & terrain

Where is Hengchun?

Hengchun sits at 22.0°N, 120.7°E, 25 m above sea level, in Taiwan. The nearest listed city is Donggang, 60 km away.

DonggangChaozhouFengshanKaohsiungTaitungTainanYongkangYujing

Topography around Hengchun

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

Within 3 km, the terrain around Hengchun has significant variations in elevation — a maximum elevation change of 368 m around an average of 58 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 887 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,015 m.

The land around Hengchun is covered by trees (51%) and cropland (22%) within 3 km, water (54%) and trees (39%) within 16 km, and water (74%) and trees (22%) within 80 km.

3 km
368 m
16 km
887 m
80 km
3,015 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Donggang 60 km · Chaozhou 64 km · Fengshan 80 km · Kaohsiung 81 km · Taitung 94 km · Tainan 123 km · Yongkang 124 km · Yujing 128 km

Taiwan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
110 / 220 V · 60 Hz
Happiness
6.7 / 10
World Happiness, 2025
Religion
Buddhist 35%Taoist 33%none or unspecified 18%folk religion approximately 10%

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 Hengchun (22.0042°, 120.7439°, elevation 25 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).