Xi'an weather in September

In September, Xi'an sees average daytime highs of 26°C and overnight lows near 17°C, with 133 mm of rain across 11.7 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 2nd-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 31% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Xi'an's 10th-clearest and 7th-windiest month. For the whole year in context, see Xi'an's year-round climate.

Daytime high
26°
5th warmest
Overnight low
17°
9th coldest
Rainfall
133 mm
11.7 wet days
Daylight
12 h 12 min
6:32 AM – 6:45 PM
Cloud cover
62%
10th clearest
Wind
5 km/h
7th windiest
Solar energy
3.81 kWh/m²
Travel score
6.3
out of 10

Xi'an is capital of Shaanxi Province, China.

Air quality
Severe
PM2.5 63.1 µg/m³ · 2018
Density
951/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 28°C in the first days to 23°C by the end.

A typical September day in Xi'an reaches about 26°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 31°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12920
22819
32819
42819
52819
62819
72719
82718
92718
102718
112618
122618
132617
142617
152617
162517
172517
182517
192516
202516
212416
222416
232416
242416
252415
262415
272315
282315
292315
302314

How September really feels in Xi'an

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.

Xi'an weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°133.22.6100.4
Feb10° / 184.1210.72.5
Mar16° / 3360.711.75.4
Apr23° / 11°4670.112.87.1
May27° / 16°718.2013.86.5
Jun31° / 20°937.3014.24.7
Jul32° / 23°14410.7014.13.8
Aug31° / 22°12910.6013.34.6
Sep26° / 17°13311.7012.26.3
Oct20° / 11°8110011.16.2
Nov13° / 406.61.110.24.0
Dec / -1°133.31.49.81.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25050
34951
44852
54753
64753
74555
84456
94357
104258
114159
124060
133961
143961
154060
163862
173862
183862
193862
203961
213961
223961
233961
243961
254060
264060
274060
284060
294060
304060

Chance of precipitation in September

Any precipitation

Xi'an gets around 133 mm of rain over 11.7 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 39% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
335
435
536
637
738
838
939
1040
1140
1241
1341
1441
1541
1641
1741
1841
1941
2041
2141
2241
2340
2440
2539
2639
2738
2838
2938
3037

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 15% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
161441336
271542316
371642295
481843274
591943264
692143243
7102243223
8102443203
9112642193
10112742172
11112941162
12123041152
13133140142
14133339132
15143439122
16153538112
17153637101
1816383691
1917393581
2018393481
2119403371
2221413261
2322413051
2424412951
2527412841
2629412630
2732402530
2835402320
2938392220
3041372020

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 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 66 minutes over September. Sunrise moves from 6:21 AM to 6:43 AM, and sunset from 7:07 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:217:07
212.76:227:05
312.76:237:04
412.66:247:02
512.66:247:01
612.66:256:59
712.56:266:58
812.56:276:57
912.56:276:55
1012.46:286:54
1112.46:296:52
1212.46:296:51
1312.36:306:49
1412.36:316:48
1512.26:326:46
1612.26:326:45
1712.26:336:43
1812.16:346:42
1912.16:346:41
2012.16:356:39
2112.06:366:38
2212.06:376:36
2312.06:376:35
2411.96:386:33
2511.96:396:32
2611.86:406:30
2711.86:406:29
2811.86:416:27
2911.76:426:26
3011.76:436:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.81 kWh/m².

For context, solar energy here swings from a low near 2.59 kWh/m² to a high of 5.75 kWh/m² in June across the year — September's 3.81 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.2Bright
74.1Bright
84.1Bright
94.0Bright
104.0Moderate
113.9Moderate
123.9Moderate
133.8Moderate
143.8Moderate
153.8Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Xi'an

In seasonPeak

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

Xi'an's rainy season runs May–October, when most of the year's rain falls.

Xi'an sees seasonal dust haze (April–May), heaviest in May.

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

Is September a good time to visit Xi'an?

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

6.3
Sightseeing
3rd-best month of the year
5.9
Beach & pool
5th-best month of the year

September is a reasonable time to visit Xi'an for sightseeing.

What to pack for Xi'an in September

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

In September, Xi'an sees daytime highs around 26°C and nights near 17°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

UV index in Xi'an 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 Xi'an peaks around July 11 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 12 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 highModerateJul 11UV 10Jan 12UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr6High
May8Very high
Jun10Very high
Jul10Very high
Aug7Very high
Sep8Very high
Oct5Moderate
Nov3Moderate
Dec2Moderate

Air quality in Xi'an 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 Xi'an is worst in January — around 82 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (August, 42 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Xi'an's WHO annual average of 63.1 µg/m³.

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyJan 1981 µg/m³Aug 1042 µg/m³
PM2.5 (µg/m³)Level
Jan82Unhealthy
Feb77Unhealthy
Mar75Unhealthy
Apr67Unhealthy
May59Unhealthy
Jun49Poor
Jul43Poor
Aug42Poor
Sep53Poor
Oct65Unhealthy
Nov72Unhealthy
Dec74Unhealthy
Location & terrain

Where is Xi'an?

Xi'an sits at 34.3°N, 108.9°E, 416 m above sea level, in China. The nearest listed city is Luoyang, 325 km away.

LuoyangSongyangZhengzhouYinchuanChongqingZhangjiajieChengduWuhan

Topography around Xi'an

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

Within 3 km, the terrain around Xi'an has only modest variations in elevation — a maximum elevation change of 34 m around an average of 409 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 385 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,645 m.

The land around Xi'an is covered by artificial surfaces (91%) within 3 km, artificial surfaces (61%) within 16 km, and trees (42%) and cropland (41%) within 80 km.

3 km
34 m
16 km
385 m
80 km
2,645 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Luoyang 325 km · Songyang 377 km · Zhengzhou 436 km · Yinchuan 525 km · Chongqing 568 km · Zhangjiajie 589 km · Chengdu 606 km · Wuhan 646 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 Xi'an (34.2583°, 108.9286°, elevation 416 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).