Wuxi weather in September

In September, Wuxi sees average daytime highs of 27°C and overnight lows near 22°C, with 88 mm of rain across 9.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 33% of the time in September, and the air most often feels muggy.

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 Wuxi's 5th-clearest and 7th-windiest month. For the whole year in context, see Wuxi's year-round climate.

Daytime high
27°
4th warmest
Overnight low
22°
9th coldest
Rainfall
88 mm
9.1 wet days
Daylight
12 h 12 min
5:47 AM – 5:59 PM
Cloud cover
58%
5th clearest
Wind
13 km/h
7th windiest
Solar energy
4.26 kWh/m²
Travel score
6.4
out of 10

Wuxi is prefecture-level city in Jiangsu, China.

Air quality
Very high
PM2.5 43.5 µg/m³ · 2018
Density
950/km²
people per km²

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 29°C in the first days to 25°C by the end.

A typical September day in Wuxi reaches about 27°C in the afternoon and slips back to 22°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62923
72823
82823
92823
102823
112823
122822
132822
142722
152722
162722
172722
182721
192721
202621
212621
222621
232620
242620
252620
262520
272520
282520
292519
302519

How September really feels in Wuxi

Once humidity and wind are folded in, September averages 3 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
3
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.

Wuxi weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7091.410.20.9
Feb / 739.20.910.81.9
Mar14° / 10311.80.311.83.7
Apr20° / 13°11010.3012.86.0
May25° / 18°13410.6013.66.6
Jun28° / 22°26113.20145.4
Jul31° / 26°17913.7013.83.8
Aug31° / 26°16814013.24.0
Sep27° / 22°889.1012.26.4
Oct22° / 16°596.7011.27.3
Nov16° / 10°627.9010.45.3
Dec10° / 486.70.4102.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34852
44852
54852
64852
74852
84951
94951
104951
114951
124951
134951
144951
155050
164951
174951
185050
195050
205050
215149
225149
235149
245149
255248
265248
275248
285149
295248
305248

Chance of precipitation in September

Any precipitation

Wuxi gets around 88 mm of rain over 9.1 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 31% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
238
337
436
535
635
734
834
933
1033
1133
1233
1332
1432
1532
1631
1731
1830
1930
2029
2129
2228
2328
2427
2527
2627
2726
2826
2926
3025

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1015253435
2016273332
3017293330
4018303327
5019323325
60210333322
70210343320
80211353319
90312353217
100314353216
110415353115
121516353013
131617352913
141719342812
151820342611
161822332510
17292433239
182102532229
192112731218
203122831197
213123030187
224133130176
234143229166
245143229145
256153328134
267163327134
278173426123
289183425113
2910203425102
3011213324102

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

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 5:38 AM to 5:56 AM, and sunset from 6:19 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:386:19
212.65:396:18
312.65:396:16
412.65:406:15
512.55:416:14
612.55:416:12
712.55:426:11
812.55:436:10
912.45:436:08
1012.45:446:07
1112.45:446:06
1212.35:456:04
1312.35:466:03
1412.35:466:02
1512.25:476:00
1612.25:475:59
1712.25:485:58
1812.15:495:56
1912.15:495:55
2012.15:505:53
2112.05:515:52
2212.05:515:51
2312.05:525:49
2411.95:525:48
2511.95:535:47
2611.95:545:45
2711.85:545:44
2811.85:555:43
2911.85:565:41
3011.75:565:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.26 kWh/m².

For context, solar energy here swings from a low near 2.55 kWh/m² to a high of 5.25 kWh/m² in May across the year — September's 4.26 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Bright
304.0Moderate
Planning a trip in September

Hazard calendar for Wuxi

In seasonPeak

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

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

Wuxi's rainy season runs May–August, when most of the year's rain falls.

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

Is September a good time to visit Wuxi?

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

6.4
Sightseeing
3rd-best month of the year
6.6
Beach & pool
1st-best month of the year

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

What to pack for Wuxi in September

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

In September, Wuxi sees daytime highs around 27°C and nights near 22°C. Pack light clothes. Worth having: rain gear. About 9 days see rain.

light clothesrain gear

UV index in Wuxi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wuxi peaks around September 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateSep 10UV 10Dec 18UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5High
Apr7High
May7High
Jun8Very high
Jul9Very high
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Wuxi 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 Wuxi is worst in December — around 59 µg/m³ PM2.5 (unhealthy), about 2.1× the cleanest month (August, 28 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Wuxi's WHO annual average of 43.5 µg/m³.

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyDec 2259 µg/m³Aug 1028 µg/m³
PM2.5 (µg/m³)Level
Jan58Unhealthy
Feb53Poor
Mar52Poor
Apr47Poor
May39Poor
Jun34Moderate
Jul28Moderate
Aug28Moderate
Sep34Moderate
Oct42Poor
Nov49Poor
Dec59Unhealthy
Location & terrain

Where is Wuxi?

Wuxi sits at 31.6°N, 120.3°E, 10 m above sea level, in China. The nearest listed city is Suzhou, 41 km away.

Qingdao

Topography around Wuxi

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

Within 3 km, the terrain around Wuxi has only modest variations in elevation — a maximum elevation change of 222 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 323 m; within 80 km, large variations in elevation — a maximum elevation change of 669 m.

The land around Wuxi is covered by artificial surfaces (75%) within 3 km, artificial surfaces (48%) within 16 km, and cropland (35%), artificial surfaces (27%) and water (21%) within 80 km.

3 km
222 m
16 km
323 m
80 km
669 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Suzhou 41 km · Shanghai 118 km · Pingyao 134 km · Hangzhou 142 km · Nanjing 153 km · Ningbo 223 km · Tunxi 280 km · Qingdao 500 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 Wuxi (31.5689°, 120.2886°, elevation 10 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). 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).