Chengdu weather in September

In September, Chengdu sees average daytime highs of 26°C and overnight lows near 19°C, with 134 mm of rain across 12.8 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 10% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Chengdu's 11th-clearest and 6th-windiest month. For the whole year in context, see Chengdu's year-round climate.

Daytime high
26°
5th warmest
Overnight low
19°
9th coldest
Rainfall
134 mm
12.8 wet days
Daylight
12 h 12 min
6:53 AM – 7:04 PM
Cloud cover
76%
11th clearest
Wind
6 km/h
6th windiest
Solar energy
2.99 kWh/m²
Travel score
5.9
out of 10

Chengdu is capital of Sichuan Province, China.

Air quality
Very high
PM2.5 49.3 µg/m³ · 2018
Density
944/km²
people per km²
Founded
~310 BCE

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 23°C by the end.

A typical September day in Chengdu reaches about 26°C in the afternoon and slips back to 19°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12821
22821
32821
42821
52721
62721
72721
82720
92720
102720
112620
122620
132620
142620
152619
162519
172519
182519
192519
202519
212519
222419
232418
242418
252418
262418
272418
282418
292318
302318

How September really feels in Chengdu

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.

Chengdu weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 3110.22.5
Feb12° / 7210.93.8
Mar17° / 10°195.511.85.8
Apr23° / 15°437.912.76.7
May27° / 18°669.713.56.1
Jun29° / 21°12811.713.95.0
Jul30° / 23°29219.813.83.6
Aug30° / 23°29019.813.13.9
Sep26° / 19°13412.812.25.9
Oct21° / 15°408.511.26.3
Nov16° / 10°164.310.45.5
Dec11° / 41.310.13.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% 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 76%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23169
33070
43070
53070
62971
72872
82773
92773
102773
112575
122575
132476
142377
152377
162278
172278
182278
192278
202080
212080
222080
232179
242179
252179
262179
272179
282278
292278
302278

Chance of precipitation in September

Any precipitation

Chengdu gets around 134 mm of rain over 12.8 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 43% and peaks near 50% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
150
250
349
449
548
648
747
847
946
1046
1145
1245
1344
1444
1543
1643
1742
1842
1941
2040
2140
2240
2339
2439
2538
2638
2737
2837
2936
3035

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1011559232
2011759212
3021957202
4122156182
5132453172
6142652152
7152850142
8163148132
9173346121
10183544111
11193742101
12110394091
13111413891
14212423681
15212443471
16213463261
17214473061
18215492851
19216502751
20316512640
21317522440
22318532330
23319532230
24421522120
25422531920
26523521820
27625511710
28727491610
29729481410
30831471310

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over September. Sunrise moves from 6:44 AM to 7:01 AM, and sunset from 7:23 PM to 6:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:447:23
212.66:447:22
312.66:457:21
412.66:467:19
512.56:467:18
612.56:477:17
712.56:477:15
812.46:487:14
912.46:497:13
1012.46:497:11
1112.36:507:10
1212.36:507:09
1312.36:517:08
1412.26:517:06
1512.26:527:05
1612.26:537:04
1712.26:537:02
1812.16:547:01
1912.16:547:00
2012.16:556:58
2112.06:556:57
2212.06:566:56
2312.06:576:54
2411.96:576:53
2511.96:586:52
2611.96:586:50
2711.86:596:49
2811.87:006:48
2911.87:006:46
3011.77:016:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.99 kWh/m².

For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 4.59 kWh/m² in May across the year — September's 2.99 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.6Moderate
33.6Moderate
43.5Moderate
53.5Moderate
63.4Moderate
73.4Moderate
83.3Moderate
93.3Moderate
103.2Moderate
113.2Moderate
123.1Moderate
133.1Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.8Moderate
202.8Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Hazard calendar for Chengdu

In seasonPeak

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

Chengdu's rainy season runs July–September, when most of the year's rain falls.

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

Is September a good time to visit Chengdu?

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

5.9
Sightseeing
4th-best month of the year
5.5
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Chengdu for sightseeing.

What to pack for Chengdu in September

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

In September, Chengdu sees daytime highs around 26°C and nights near 19°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

UV index in Chengdu in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chengdu peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 16UV 10Jan 11UV 2
UV index (midday)Level
Jan2Moderate
Feb5Moderate
Mar7High
Apr7High
May9Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Chengdu 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 Chengdu is worst in January — around 60 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Chengdu's WHO annual average of 49.3 µg/m³.

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyJan 1859 µg/m³Aug 1038 µg/m³
PM2.5 (µg/m³)Level
Jan60Unhealthy
Feb58Unhealthy
Mar57Unhealthy
Apr50Poor
May47Poor
Jun39Poor
Jul38Poor
Aug38Poor
Sep44Poor
Oct49Poor
Nov54Poor
Dec57Unhealthy
Location & terrain

Where is Chengdu?

Chengdu sits at 30.7°N, 104.1°E, 499 m above sea level, in China. The nearest listed city is Leshan, 126 km away.

GuiyangShangri-LaLijiangXi'anFenghuangKunming

Topography around Chengdu

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

Within 3 km, the terrain around Chengdu has only modest variations in elevation — a maximum elevation change of 42 m around an average of 501 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 124 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,717 m.

The land around Chengdu is covered by artificial surfaces (88%) within 3 km, artificial surfaces (55%) within 16 km, and trees (53%) and cropland (33%) within 80 km.

3 km
42 m
16 km
124 m
80 km
3,717 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Leshan 126 km · Chongqing 269 km · Guiyang 523 km · Shangri-La 528 km · Lijiang 565 km · Xi'an 606 km · Fenghuang 616 km · Kunming 640 km

China travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / I
220 V · 50 Hz
Prices
≈ 47% of US
price level, 2025
GDP per capita
$13,862
2025
Happiness
6.1 / 10
World Happiness, 2025
Homicide rate
0.5
per 100k, 2020
Road deaths
17.4
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 464
Religion
unaffiliated 52%folk religion 22%Buddhist 18%Christian 5%

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 Chengdu (30.6667°, 104.0667°, elevation 499 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. 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).