New Taipei City weather in September

In September, New Taipei City sees average daytime highs of 29°C and overnight lows near 23°C, with 258 mm of rain across 16.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 30°C in the first days to 27°C by the end. The sky is clear or mostly clear about 22% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is New Taipei City's 1st-clearest and 6th-windiest month. For the whole year in context, see New Taipei City's year-round climate.

Daytime high
29°
4th warmest
Overnight low
23°
9th coldest
Rainfall
258 mm
16.9 wet days
Daylight
12 h 06 min
5:44 AM – 5:53 PM
Cloud cover
65%
1st clearest
Wind
9 km/h
6th windiest
Solar energy
4.46 kWh/m²
Travel score
4.6
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 30°C in the first days to 27°C by the end.

A typical September day in New Taipei City reaches about 29°C in the afternoon and slips back to 23°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 32°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13024
23024
33024
43024
53024
63024
73024
83024
93024
103023
112923
122923
132923
142923
152923
162923
172923
182923
192923
202823
212823
222823
232822
242822
252822
262822
272822
282722
292722
302722

How September really feels in New Taipei City

Once humidity and wind are folded in, September averages 14 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
14
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.

New Taipei City weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 12°8714.110.64.8
Feb18° / 12°951211.15.2
Mar21° / 14°10513.911.85.6
Apr24° / 17°13216.312.65.6
May27° / 21°20019.813.24.9
Jun30° / 23°24120.913.53.6
Jul31° / 25°22619.113.43.3
Aug31° / 25°30220.812.93.4
Sep29° / 23°25816.912.24.6
Oct25° / 20°21316.511.45.7
Nov22° / 17°13715.510.85.7
Dec19° / 14°1081510.55.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
43862
53961
64060
74060
84060
94159
104357
114357
124456
134456
144456
154456
164456
174456
184258
194159
204159
214159
224159
234159
244060
254060
264159
273961
283961
293961
303862

Chance of precipitation in September

Any precipitation

New Taipei City gets around 258 mm of rain over 16.9 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 56% and peaks near 63% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
163
263
362
462
561
661
760
859
959
1058
1157
1256
1356
1455
1555
1654
1754
1854
1954
2053
2153
2253
2353
2453
2553
2653
2754
2854
2955
3056

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 66% of days. Sticky, muggy-or-worse air turns up on roughly 91% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10257617
20267616
30277615
40277714
50387613
60397612
70397711
804107610
90411769
100512758
110612748
120713737
130714736
140815716
150916705
160918685
1701019665
1801020655
1901122634
2011123614
2111224594
2211226574
2311227573
2421227563
2521228553
2621229552
2731330522
2831330522
2931330522
3041431502

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 7 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
17calm
27calm
37calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
119calm
129calm
139calm
149calm
159calm
169calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 5:38 AM to 5:50 AM, and sunset from 6:09 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:386:09
212.55:396:08
312.55:396:07
412.45:406:06
512.45:406:05
612.45:406:04
712.45:416:03
812.35:416:02
912.35:426:01
1012.35:426:00
1112.35:425:58
1212.25:435:57
1312.25:435:56
1412.25:435:55
1512.25:445:54
1612.15:445:53
1712.15:455:52
1812.15:455:51
1912.15:455:49
2012.05:465:48
2112.05:465:47
2212.05:465:46
2312.05:475:45
2411.95:475:44
2511.95:485:43
2611.95:485:42
2711.95:485:41
2811.85:495:39
2911.85:495:38
3011.85:505:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.46 kWh/m².

For context, solar energy here swings from a low near 2.09 kWh/m² to a high of 5.66 kWh/m² in July across the year — September's 4.46 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.0Bright
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for New Taipei City

In seasonPeak

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

New Taipei City sits in the Pacific typhoon belt; the season peaks July–October.

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

Is September a good time to visit New Taipei City?

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

4.6
Sightseeing
9th-best month of the year
5.6
Beach & pool
1st-best month of the year

September is a reasonable time to visit New Taipei City for sightseeing.

What to pack for New Taipei City in September

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

In September, New Taipei City sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. About 17 days see rain.

light clothesrain gear

Sea temperature near New Taipei City 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 offshore is warmest in August at about 29°C and coldest in February near 18°C.

It's comfortable for a long swim from Mar 19 to Dec 24 — about 9.2 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb18Cool
Mar20Cool
Apr23Refreshing
May26Warm
Jun27Warm
Jul29Tropical
Aug29Tropical
Sep28Warm
Oct25Warm
Nov23Refreshing
Dec21Refreshing

UV index in New Taipei City 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 New Taipei City peaks around June 18 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highVery highHighJun 18UV 11Dec 22UV 4
UV index (midday)Level
Jan5Moderate
Feb7Very high
Mar9Very high
Apr8Very high
May10Extreme
Jun12Extreme
Jul11Extreme
Aug9Very high
Sep11Extreme
Oct8Very high
Nov7High
Dec4Moderate

Air quality in New Taipei City 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 New Taipei City is worst in April — around 52 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (October, 25 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateApr 1052 µg/m³Oct 1626 µg/m³
PM2.5 (µg/m³)Level
Jan38Poor
Feb43Poor
Mar51Poor
Apr52Poor
May44Poor
Jun41Poor
Jul32Moderate
Aug32Moderate
Sep30Moderate
Oct25Moderate
Nov32Moderate
Dec32Moderate
Location & terrain

Where is New Taipei City?

New Taipei City sits at 25.1°N, 121.5°E, 4 m above sea level, in Taiwan. The nearest listed city is Banqiao, 5.0 km away.

Topography around New Taipei City

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

Within 3 km, the terrain around New Taipei City has only modest variations in elevation — a maximum elevation change of 140 m around an average of 11 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,106 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,839 m.

The land around New Taipei City is covered by artificial surfaces (78%) within 3 km, trees (55%) and artificial surfaces (34%) within 16 km, and water (54%) and trees (39%) within 80 km.

3 km
140 m
16 km
1,106 m
80 km
3,839 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Banqiao 5.0 km · Taipei 7.0 km · Shulin 9.0 km · Danshui 12 km · Neihu 13 km · Yingge 16 km · Sanxia 17 km · Taoyuan 18 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 New Taipei City (25.062°, 121.457°, elevation 4 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).