Dalian weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – October
What is the weather like in Dalian in September?
In September, Dalian is warm: daytime highs average 23 °C, and nights cool down to about 19 °C. The sea averages 22.8 °C – refreshing for a swim. The sun shines for around 8 hours a day. Rain falls on about 5 days, adding up to 56 mm. All in all, September is an excellent month for a holiday in Dalian.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 82 | 93 | 86 |
| Day | 27° | 23° | 17° |
| Night | 23° | 19° | 13° |
| Sea | 25° | 23° | 19° |
| Sun | 7 h | 8 h | 7 h |
| Rain days | 9 | 5 | 6 |
More details for September
- Daylight
- 12 h 30 min05:34 – 18:04
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 12 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 44 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+8Asia/Shanghai
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %80 %
- Few rainy daysweight 30 %91 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
Dalian in September: quick answers
Is Dalian hot in September?
Warm rather than hot: in September, daytime highs in Dalian average 23 °C and nights cool to about 19 °C.
Can you swim in Dalian in September?
Yes. In September the sea averages 22.8 °C – refreshing for a swim.
Does it rain much in Dalian in September?
Rain falls on about 5 days, adding up to 56 mm.
Dalian month by month
The whole year in DalianAll destinations: ChinaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences