Dalian weather in September

In September, Dalian sees average daytime highs of 23°C and overnight lows near 20°C, with 51 mm of rain across 5.3 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 21°C by the end. The sky is clear or mostly clear about 52% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Dalian's 5th-clearest and 9th-windiest month. For the whole year in context, see Dalian's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
51 mm
5.3 wet days
Daylight
12 h 12 min
5:40 AM – 5:55 PM
Cloud cover
42%
5th clearest
Wind
17 km/h
9th windiest
Solar energy
4.79 kWh/m²
Travel score
7.8
out of 10

Dalian is city in Liaoning, China.

Air quality
Very high
PM2.5 35.1 µg/m³ · 2018
Density
361/km²
people per km²
Founded
1904

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 24°C in the first days to 21°C by the end.

A typical September day in Dalian reaches about 23°C in the afternoon and slips back to 20°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 24°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12422
22422
32422
42422
52422
62422
72422
82422
92421
102321
112321
122321
132321
142321
152321
162320
172220
182220
192220
202220
212220
222219
232119
242119
252119
262119
272118
282118
292018
302018

How September really feels in Dalian

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.

Dalian weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°71.929.60.0
Feb / -2°102110.50.0
Mar / 153.10.711.70.2
Apr10° / 365.40.1132.5
May15° / 13°596014.15.3
Jun21° / 19°806.8014.77.0
Jul25° / 23°1369.5014.47.0
Aug26° / 24°1408.7013.57.1
Sep23° / 20°515.3012.37.8
Oct17° / 14°335.60116.2
Nov10° / 284.70.89.92.5
Dec / -0°123.22.19.30.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 36%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36139
46337
56337
66337
76436
86436
96337
106337
116436
126436
136337
146436
156436
166535
176436
186436
196436
206535
216436
226436
236436
246535
256535
266535
276535
286634
296535
306535

Chance of precipitation in September

Any precipitation

Dalian gets around 51 mm of rain over 5.3 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 18% and peaks near 21% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
121
220
320
419
519
618
718
817
917
1017
1116
1216
1316
1416
1516
1616
1716
1816
1917
2017
2117
2218
2318
2419
2519
2620
2720
2820
2920
3020

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 35% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1491640301
2591740281
36101840251
46111940231
57112040201
68122140181
79132340160
810142439140
911142538120
1012152637100
111316263590
121517273380
131617283270
141718293060
151918292850
162019302650
172220302440
182320312330
192421312130
202621311930
212722311720
222922311620
233123311410
243223311310
253523301210
263723291110
273923281000
28412327900
29432226800
30452225700

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3019light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:27 AM to 5:54 AM, and sunset from 6:20 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:276:20
212.85:286:18
312.85:286:17
412.85:296:15
512.75:306:14
612.75:316:12
712.65:326:10
812.65:336:09
912.65:346:07
1012.55:356:05
1112.55:366:04
1212.45:376:02
1312.45:386:00
1412.35:395:59
1512.35:405:57
1612.25:405:55
1712.25:415:54
1812.25:425:52
1912.15:435:50
2012.15:445:49
2112.05:455:47
2212.05:465:45
2311.95:475:44
2411.95:485:42
2511.95:495:40
2611.85:505:39
2711.85:515:37
2811.75:525:35
2911.75:535:34
3011.65:545:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.79 kWh/m².

For context, solar energy here swings from a low near 2.15 kWh/m² to a high of 6.22 kWh/m² in June across the year — September's 4.79 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.7Bright
224.6Bright
234.6Bright
244.6Bright
254.5Bright
264.5Bright
274.4Bright
284.4Bright
294.4Bright
304.3Bright
Planning a trip in September

Hazard calendar for Dalian

In seasonPeak

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

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

Dalian's rainy season runs June–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 Dalian?

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

7.8
Sightseeing
1st-best month of the year
5.6
Beach & pool
3rd-best month of the year

September is one of the better times to visit Dalian for general sightseeing.

What to pack for Dalian in September

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

In September, Dalian sees daytime highs around 23°C and nights near 20°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Dalian in September

The nearest coast averages about 23°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 24°C and coldest in February near 3°C.

It's comfortable for a long swim from Jul 5 to Oct 4 — about 3 months when the water holds above 20°C.

0°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan5Bracing
Feb3Bracing
Mar4Bracing
Apr7Bracing
May12Bracing
Jun17Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct19Cool
Nov14Bracing
Dec9Bracing

UV index in Dalian in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Dalian peaks around August 18 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateLowAug 18UV 7Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May6High
Jun6High
Jul7High
Aug7Very high
Sep7High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Dalian 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 Dalian is worst in March — around 52 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (September, 24 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Dalian's WHO annual average of 35.1 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMar 2151 µg/m³Sep 1224 µg/m³
PM2.5 (µg/m³)Level
Jan36Poor
Feb41Poor
Mar52Poor
Apr49Poor
May41Poor
Jun33Moderate
Jul30Moderate
Aug25Moderate
Sep24Moderate
Oct29Moderate
Nov32Moderate
Dec30Moderate
Location & terrain

Where is Dalian?

Dalian sits at 38.9°N, 121.6°E, 33 m above sea level, in China. The nearest listed city is Sinŭiju, 274 km away.

Kwail-ŭpChangyŏnSonghwaŬllyulChaeryŏng-niChŏngju

Topography around Dalian

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

Within 3 km, the terrain around Dalian has only modest variations in elevation — a maximum elevation change of 218 m around an average of 35 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 442 m; within 80 km, large variations in elevation — a maximum elevation change of 677 m.

The land around Dalian is covered by artificial surfaces (77%) within 3 km, water (45%), artificial surfaces (27%) and trees (22%) within 16 km, and water (71%) within 80 km.

3 km
218 m
16 km
442 m
80 km
677 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sinŭiju 274 km · Uiju 289 km · Kwail-ŭp 301 km · Changyŏn 312 km · Songhwa 313 km · Ŭllyul 314 km · Chaeryŏng-ni 315 km · Chŏngju 322 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 Dalian (38.9122°, 121.6022°, elevation 33 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).